[79a0317] | 1 | /*
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| 2 | MIT License http://www.opensource.org/licenses/mit-license.php
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| 3 | Author Tobias Koppers @sokra
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| 4 | */
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| 5 |
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| 6 | "use strict";
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| 7 |
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| 8 | const {
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| 9 | JAVASCRIPT_MODULE_TYPE_AUTO,
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| 10 | JAVASCRIPT_MODULE_TYPE_DYNAMIC,
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| 11 | JAVASCRIPT_MODULE_TYPE_ESM
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| 12 | } = require("./ModuleTypeConstants");
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| 13 | const CachedConstDependency = require("./dependencies/CachedConstDependency");
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| 14 | const ConstDependency = require("./dependencies/ConstDependency");
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| 15 | const { evaluateToString } = require("./javascript/JavascriptParserHelpers");
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| 16 | const { parseResource } = require("./util/identifier");
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| 17 |
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| 18 | /** @typedef {import("estree").AssignmentProperty} AssignmentProperty */
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| 19 | /** @typedef {import("estree").Expression} Expression */
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| 20 | /** @typedef {import("estree").Identifier} Identifier */
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| 21 | /** @typedef {import("estree").Pattern} Pattern */
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| 22 | /** @typedef {import("estree").SourceLocation} SourceLocation */
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| 23 | /** @typedef {import("estree").Statement} Statement */
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| 24 | /** @typedef {import("estree").Super} Super */
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| 25 | /** @typedef {import("./Compiler")} Compiler */
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| 26 | /** @typedef {import("./javascript/BasicEvaluatedExpression")} BasicEvaluatedExpression */
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| 27 | /** @typedef {import("./javascript/JavascriptParser")} JavascriptParser */
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| 28 | /** @typedef {import("./javascript/JavascriptParser").Range} Range */
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| 29 |
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| 30 | /**
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| 31 | * @param {Set<string>} declarations set of declarations
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| 32 | * @param {Identifier | Pattern} pattern pattern to collect declarations from
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| 33 | */
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| 34 | const collectDeclaration = (declarations, pattern) => {
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| 35 | const stack = [pattern];
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| 36 | while (stack.length > 0) {
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| 37 | const node = /** @type {Pattern} */ (stack.pop());
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| 38 | switch (node.type) {
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| 39 | case "Identifier":
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| 40 | declarations.add(node.name);
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| 41 | break;
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| 42 | case "ArrayPattern":
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| 43 | for (const element of node.elements) {
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| 44 | if (element) {
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| 45 | stack.push(element);
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| 46 | }
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| 47 | }
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| 48 | break;
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| 49 | case "AssignmentPattern":
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| 50 | stack.push(node.left);
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| 51 | break;
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| 52 | case "ObjectPattern":
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| 53 | for (const property of node.properties) {
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| 54 | stack.push(/** @type {AssignmentProperty} */ (property).value);
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| 55 | }
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| 56 | break;
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| 57 | case "RestElement":
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| 58 | stack.push(node.argument);
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| 59 | break;
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| 60 | }
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| 61 | }
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| 62 | };
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| 63 |
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| 64 | /**
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| 65 | * @param {Statement} branch branch to get hoisted declarations from
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| 66 | * @param {boolean} includeFunctionDeclarations whether to include function declarations
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| 67 | * @returns {Array<string>} hoisted declarations
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| 68 | */
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| 69 | const getHoistedDeclarations = (branch, includeFunctionDeclarations) => {
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| 70 | const declarations = new Set();
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| 71 | /** @type {Array<TODO | null | undefined>} */
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| 72 | const stack = [branch];
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| 73 | while (stack.length > 0) {
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| 74 | const node = stack.pop();
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| 75 | // Some node could be `null` or `undefined`.
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| 76 | if (!node) continue;
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| 77 | switch (node.type) {
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| 78 | // Walk through control statements to look for hoisted declarations.
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| 79 | // Some branches are skipped since they do not allow declarations.
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| 80 | case "BlockStatement":
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| 81 | for (const stmt of node.body) {
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| 82 | stack.push(stmt);
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| 83 | }
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| 84 | break;
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| 85 | case "IfStatement":
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| 86 | stack.push(node.consequent);
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| 87 | stack.push(node.alternate);
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| 88 | break;
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| 89 | case "ForStatement":
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| 90 | stack.push(node.init);
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| 91 | stack.push(node.body);
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| 92 | break;
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| 93 | case "ForInStatement":
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| 94 | case "ForOfStatement":
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| 95 | stack.push(node.left);
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| 96 | stack.push(node.body);
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| 97 | break;
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| 98 | case "DoWhileStatement":
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| 99 | case "WhileStatement":
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| 100 | case "LabeledStatement":
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| 101 | stack.push(node.body);
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| 102 | break;
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| 103 | case "SwitchStatement":
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| 104 | for (const cs of node.cases) {
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| 105 | for (const consequent of cs.consequent) {
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| 106 | stack.push(consequent);
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| 107 | }
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| 108 | }
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| 109 | break;
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| 110 | case "TryStatement":
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| 111 | stack.push(node.block);
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| 112 | if (node.handler) {
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| 113 | stack.push(node.handler.body);
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| 114 | }
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| 115 | stack.push(node.finalizer);
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| 116 | break;
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| 117 | case "FunctionDeclaration":
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| 118 | if (includeFunctionDeclarations) {
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| 119 | collectDeclaration(declarations, /** @type {Identifier} */ (node.id));
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| 120 | }
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| 121 | break;
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| 122 | case "VariableDeclaration":
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| 123 | if (node.kind === "var") {
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| 124 | for (const decl of node.declarations) {
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| 125 | collectDeclaration(declarations, decl.id);
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| 126 | }
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| 127 | }
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| 128 | break;
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| 129 | }
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| 130 | }
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| 131 | return Array.from(declarations);
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| 132 | };
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| 133 |
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| 134 | const PLUGIN_NAME = "ConstPlugin";
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| 135 |
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| 136 | class ConstPlugin {
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| 137 | /**
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| 138 | * Apply the plugin
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| 139 | * @param {Compiler} compiler the compiler instance
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| 140 | * @returns {void}
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| 141 | */
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| 142 | apply(compiler) {
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| 143 | const cachedParseResource = parseResource.bindCache(compiler.root);
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| 144 | compiler.hooks.compilation.tap(
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| 145 | PLUGIN_NAME,
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| 146 | (compilation, { normalModuleFactory }) => {
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| 147 | compilation.dependencyTemplates.set(
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| 148 | ConstDependency,
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| 149 | new ConstDependency.Template()
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| 150 | );
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| 151 |
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| 152 | compilation.dependencyTemplates.set(
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| 153 | CachedConstDependency,
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| 154 | new CachedConstDependency.Template()
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| 155 | );
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| 156 |
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| 157 | /**
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| 158 | * @param {JavascriptParser} parser the parser
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| 159 | */
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| 160 | const handler = parser => {
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| 161 | parser.hooks.statementIf.tap(PLUGIN_NAME, statement => {
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| 162 | if (parser.scope.isAsmJs) return;
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| 163 | const param = parser.evaluateExpression(statement.test);
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| 164 | const bool = param.asBool();
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| 165 | if (typeof bool === "boolean") {
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| 166 | if (!param.couldHaveSideEffects()) {
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| 167 | const dep = new ConstDependency(
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| 168 | `${bool}`,
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| 169 | /** @type {Range} */ (param.range)
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| 170 | );
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| 171 | dep.loc = /** @type {SourceLocation} */ (statement.loc);
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| 172 | parser.state.module.addPresentationalDependency(dep);
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| 173 | } else {
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| 174 | parser.walkExpression(statement.test);
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| 175 | }
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| 176 | const branchToRemove = bool
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| 177 | ? statement.alternate
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| 178 | : statement.consequent;
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| 179 | if (branchToRemove) {
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| 180 | // Before removing the dead branch, the hoisted declarations
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| 181 | // must be collected.
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| 182 | //
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| 183 | // Given the following code:
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| 184 | //
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| 185 | // if (true) f() else g()
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| 186 | // if (false) {
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| 187 | // function f() {}
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| 188 | // const g = function g() {}
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| 189 | // if (someTest) {
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| 190 | // let a = 1
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| 191 | // var x, {y, z} = obj
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| 192 | // }
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| 193 | // } else {
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| 194 | // …
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| 195 | // }
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| 196 | //
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| 197 | // the generated code is:
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| 198 | //
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| 199 | // if (true) f() else {}
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| 200 | // if (false) {
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| 201 | // var f, x, y, z; (in loose mode)
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| 202 | // var x, y, z; (in strict mode)
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| 203 | // } else {
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| 204 | // …
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| 205 | // }
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| 206 | //
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| 207 | // NOTE: When code runs in strict mode, `var` declarations
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| 208 | // are hoisted but `function` declarations don't.
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| 209 | //
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| 210 | const declarations = parser.scope.isStrict
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| 211 | ? getHoistedDeclarations(branchToRemove, false)
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| 212 | : getHoistedDeclarations(branchToRemove, true);
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| 213 | const replacement =
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| 214 | declarations.length > 0
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| 215 | ? `{ var ${declarations.join(", ")}; }`
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| 216 | : "{}";
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| 217 | const dep = new ConstDependency(
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| 218 | replacement,
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| 219 | /** @type {Range} */ (branchToRemove.range)
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| 220 | );
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| 221 | dep.loc = /** @type {SourceLocation} */ (branchToRemove.loc);
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| 222 | parser.state.module.addPresentationalDependency(dep);
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| 223 | }
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| 224 | return bool;
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| 225 | }
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| 226 | });
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| 227 | parser.hooks.expressionConditionalOperator.tap(
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| 228 | PLUGIN_NAME,
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| 229 | expression => {
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| 230 | if (parser.scope.isAsmJs) return;
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| 231 | const param = parser.evaluateExpression(expression.test);
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| 232 | const bool = param.asBool();
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| 233 | if (typeof bool === "boolean") {
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| 234 | if (!param.couldHaveSideEffects()) {
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| 235 | const dep = new ConstDependency(
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| 236 | ` ${bool}`,
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| 237 | /** @type {Range} */ (param.range)
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| 238 | );
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| 239 | dep.loc = /** @type {SourceLocation} */ (expression.loc);
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| 240 | parser.state.module.addPresentationalDependency(dep);
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| 241 | } else {
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| 242 | parser.walkExpression(expression.test);
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| 243 | }
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| 244 | // Expressions do not hoist.
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| 245 | // It is safe to remove the dead branch.
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| 246 | //
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| 247 | // Given the following code:
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| 248 | //
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| 249 | // false ? someExpression() : otherExpression();
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| 250 | //
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| 251 | // the generated code is:
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| 252 | //
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| 253 | // false ? 0 : otherExpression();
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| 254 | //
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| 255 | const branchToRemove = bool
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| 256 | ? expression.alternate
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| 257 | : expression.consequent;
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| 258 | const dep = new ConstDependency(
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| 259 | "0",
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| 260 | /** @type {Range} */ (branchToRemove.range)
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| 261 | );
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| 262 | dep.loc = /** @type {SourceLocation} */ (branchToRemove.loc);
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| 263 | parser.state.module.addPresentationalDependency(dep);
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| 264 | return bool;
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| 265 | }
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| 266 | }
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| 267 | );
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| 268 | parser.hooks.expressionLogicalOperator.tap(
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| 269 | PLUGIN_NAME,
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| 270 | expression => {
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| 271 | if (parser.scope.isAsmJs) return;
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| 272 | if (
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| 273 | expression.operator === "&&" ||
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| 274 | expression.operator === "||"
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| 275 | ) {
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| 276 | const param = parser.evaluateExpression(expression.left);
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| 277 | const bool = param.asBool();
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| 278 | if (typeof bool === "boolean") {
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| 279 | // Expressions do not hoist.
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| 280 | // It is safe to remove the dead branch.
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| 281 | //
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| 282 | // ------------------------------------------
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| 283 | //
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| 284 | // Given the following code:
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| 285 | //
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| 286 | // falsyExpression() && someExpression();
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| 287 | //
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| 288 | // the generated code is:
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| 289 | //
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| 290 | // falsyExpression() && false;
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| 291 | //
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| 292 | // ------------------------------------------
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| 293 | //
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| 294 | // Given the following code:
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| 295 | //
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| 296 | // truthyExpression() && someExpression();
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| 297 | //
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| 298 | // the generated code is:
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| 299 | //
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| 300 | // true && someExpression();
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| 301 | //
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| 302 | // ------------------------------------------
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| 303 | //
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| 304 | // Given the following code:
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| 305 | //
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| 306 | // truthyExpression() || someExpression();
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| 307 | //
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| 308 | // the generated code is:
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| 309 | //
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| 310 | // truthyExpression() || false;
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| 311 | //
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| 312 | // ------------------------------------------
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| 313 | //
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| 314 | // Given the following code:
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| 315 | //
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| 316 | // falsyExpression() || someExpression();
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| 317 | //
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| 318 | // the generated code is:
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| 319 | //
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| 320 | // false && someExpression();
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| 321 | //
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| 322 | const keepRight =
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| 323 | (expression.operator === "&&" && bool) ||
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| 324 | (expression.operator === "||" && !bool);
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| 325 |
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| 326 | if (
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| 327 | !param.couldHaveSideEffects() &&
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| 328 | (param.isBoolean() || keepRight)
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| 329 | ) {
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| 330 | // for case like
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| 331 | //
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| 332 | // return'development'===process.env.NODE_ENV&&'foo'
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| 333 | //
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| 334 | // we need a space before the bool to prevent result like
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| 335 | //
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| 336 | // returnfalse&&'foo'
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| 337 | //
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| 338 | const dep = new ConstDependency(
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| 339 | ` ${bool}`,
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| 340 | /** @type {Range} */ (param.range)
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| 341 | );
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| 342 | dep.loc = /** @type {SourceLocation} */ (expression.loc);
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| 343 | parser.state.module.addPresentationalDependency(dep);
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| 344 | } else {
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| 345 | parser.walkExpression(expression.left);
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| 346 | }
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| 347 | if (!keepRight) {
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| 348 | const dep = new ConstDependency(
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| 349 | "0",
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| 350 | /** @type {Range} */ (expression.right.range)
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| 351 | );
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| 352 | dep.loc = /** @type {SourceLocation} */ (expression.loc);
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| 353 | parser.state.module.addPresentationalDependency(dep);
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| 354 | }
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| 355 | return keepRight;
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| 356 | }
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| 357 | } else if (expression.operator === "??") {
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| 358 | const param = parser.evaluateExpression(expression.left);
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| 359 | const keepRight = param.asNullish();
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| 360 | if (typeof keepRight === "boolean") {
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| 361 | // ------------------------------------------
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| 362 | //
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| 363 | // Given the following code:
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| 364 | //
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| 365 | // nonNullish ?? someExpression();
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| 366 | //
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| 367 | // the generated code is:
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| 368 | //
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| 369 | // nonNullish ?? 0;
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| 370 | //
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| 371 | // ------------------------------------------
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| 372 | //
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| 373 | // Given the following code:
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| 374 | //
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| 375 | // nullish ?? someExpression();
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| 376 | //
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| 377 | // the generated code is:
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| 378 | //
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| 379 | // null ?? someExpression();
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| 380 | //
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| 381 | if (!param.couldHaveSideEffects() && keepRight) {
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| 382 | // cspell:word returnnull
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| 383 | // for case like
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| 384 | //
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| 385 | // return('development'===process.env.NODE_ENV&&null)??'foo'
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| 386 | //
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| 387 | // we need a space before the bool to prevent result like
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| 388 | //
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| 389 | // returnnull??'foo'
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| 390 | //
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| 391 | const dep = new ConstDependency(
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| 392 | " null",
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| 393 | /** @type {Range} */ (param.range)
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| 394 | );
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| 395 | dep.loc = /** @type {SourceLocation} */ (expression.loc);
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| 396 | parser.state.module.addPresentationalDependency(dep);
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| 397 | } else {
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| 398 | const dep = new ConstDependency(
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| 399 | "0",
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| 400 | /** @type {Range} */ (expression.right.range)
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| 401 | );
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| 402 | dep.loc = /** @type {SourceLocation} */ (expression.loc);
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| 403 | parser.state.module.addPresentationalDependency(dep);
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| 404 | parser.walkExpression(expression.left);
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| 405 | }
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| 406 |
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| 407 | return keepRight;
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| 408 | }
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| 409 | }
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| 410 | }
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| 411 | );
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| 412 | parser.hooks.optionalChaining.tap(PLUGIN_NAME, expr => {
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| 413 | /** @type {Expression[]} */
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| 414 | const optionalExpressionsStack = [];
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| 415 | /** @type {Expression | Super} */
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| 416 | let next = expr.expression;
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| 417 |
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| 418 | while (
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| 419 | next.type === "MemberExpression" ||
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| 420 | next.type === "CallExpression"
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| 421 | ) {
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| 422 | if (next.type === "MemberExpression") {
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| 423 | if (next.optional) {
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| 424 | // SuperNode can not be optional
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| 425 | optionalExpressionsStack.push(
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| 426 | /** @type {Expression} */ (next.object)
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| 427 | );
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| 428 | }
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| 429 | next = next.object;
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| 430 | } else {
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| 431 | if (next.optional) {
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| 432 | // SuperNode can not be optional
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| 433 | optionalExpressionsStack.push(
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| 434 | /** @type {Expression} */ (next.callee)
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| 435 | );
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| 436 | }
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| 437 | next = next.callee;
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| 438 | }
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| 439 | }
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| 440 |
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| 441 | while (optionalExpressionsStack.length) {
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| 442 | const expression = optionalExpressionsStack.pop();
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| 443 | const evaluated = parser.evaluateExpression(
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| 444 | /** @type {Expression} */ (expression)
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| 445 | );
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| 446 |
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| 447 | if (evaluated.asNullish()) {
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| 448 | // ------------------------------------------
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| 449 | //
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| 450 | // Given the following code:
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| 451 | //
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| 452 | // nullishMemberChain?.a.b();
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| 453 | //
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| 454 | // the generated code is:
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| 455 | //
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| 456 | // undefined;
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| 457 | //
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| 458 | // ------------------------------------------
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| 459 | //
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| 460 | const dep = new ConstDependency(
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| 461 | " undefined",
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| 462 | /** @type {Range} */ (expr.range)
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| 463 | );
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| 464 | dep.loc = /** @type {SourceLocation} */ (expr.loc);
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| 465 | parser.state.module.addPresentationalDependency(dep);
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| 466 | return true;
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| 467 | }
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| 468 | }
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| 469 | });
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| 470 | parser.hooks.evaluateIdentifier
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| 471 | .for("__resourceQuery")
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| 472 | .tap(PLUGIN_NAME, expr => {
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| 473 | if (parser.scope.isAsmJs) return;
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| 474 | if (!parser.state.module) return;
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| 475 | return evaluateToString(
|
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| 476 | cachedParseResource(parser.state.module.resource).query
|
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| 477 | )(expr);
|
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| 478 | });
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| 479 | parser.hooks.expression
|
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| 480 | .for("__resourceQuery")
|
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| 481 | .tap(PLUGIN_NAME, expr => {
|
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| 482 | if (parser.scope.isAsmJs) return;
|
---|
| 483 | if (!parser.state.module) return;
|
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| 484 | const dep = new CachedConstDependency(
|
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| 485 | JSON.stringify(
|
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| 486 | cachedParseResource(parser.state.module.resource).query
|
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| 487 | ),
|
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| 488 | /** @type {Range} */ (expr.range),
|
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| 489 | "__resourceQuery"
|
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| 490 | );
|
---|
| 491 | dep.loc = /** @type {SourceLocation} */ (expr.loc);
|
---|
| 492 | parser.state.module.addPresentationalDependency(dep);
|
---|
| 493 | return true;
|
---|
| 494 | });
|
---|
| 495 |
|
---|
| 496 | parser.hooks.evaluateIdentifier
|
---|
| 497 | .for("__resourceFragment")
|
---|
| 498 | .tap(PLUGIN_NAME, expr => {
|
---|
| 499 | if (parser.scope.isAsmJs) return;
|
---|
| 500 | if (!parser.state.module) return;
|
---|
| 501 | return evaluateToString(
|
---|
| 502 | cachedParseResource(parser.state.module.resource).fragment
|
---|
| 503 | )(expr);
|
---|
| 504 | });
|
---|
| 505 | parser.hooks.expression
|
---|
| 506 | .for("__resourceFragment")
|
---|
| 507 | .tap(PLUGIN_NAME, expr => {
|
---|
| 508 | if (parser.scope.isAsmJs) return;
|
---|
| 509 | if (!parser.state.module) return;
|
---|
| 510 | const dep = new CachedConstDependency(
|
---|
| 511 | JSON.stringify(
|
---|
| 512 | cachedParseResource(parser.state.module.resource).fragment
|
---|
| 513 | ),
|
---|
| 514 | /** @type {Range} */ (expr.range),
|
---|
| 515 | "__resourceFragment"
|
---|
| 516 | );
|
---|
| 517 | dep.loc = /** @type {SourceLocation} */ (expr.loc);
|
---|
| 518 | parser.state.module.addPresentationalDependency(dep);
|
---|
| 519 | return true;
|
---|
| 520 | });
|
---|
| 521 | };
|
---|
| 522 |
|
---|
| 523 | normalModuleFactory.hooks.parser
|
---|
| 524 | .for(JAVASCRIPT_MODULE_TYPE_AUTO)
|
---|
| 525 | .tap(PLUGIN_NAME, handler);
|
---|
| 526 | normalModuleFactory.hooks.parser
|
---|
| 527 | .for(JAVASCRIPT_MODULE_TYPE_DYNAMIC)
|
---|
| 528 | .tap(PLUGIN_NAME, handler);
|
---|
| 529 | normalModuleFactory.hooks.parser
|
---|
| 530 | .for(JAVASCRIPT_MODULE_TYPE_ESM)
|
---|
| 531 | .tap(PLUGIN_NAME, handler);
|
---|
| 532 | }
|
---|
| 533 | );
|
---|
| 534 | }
|
---|
| 535 | }
|
---|
| 536 |
|
---|
| 537 | module.exports = ConstPlugin;
|
---|