1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | import * as o from './output/output_ast';
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9 | import { generateForwardRef } from './render3/partial/util';
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10 | import { compileFactoryFunction, FactoryTarget, R3FactoryDelegateType } from './render3/r3_factory';
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11 | import { Identifiers } from './render3/r3_identifiers';
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12 | import { typeWithParameters } from './render3/util';
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13 | import { DefinitionMap } from './render3/view/util';
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14 | export function createR3ProviderExpression(expression, isForwardRef) {
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15 | return { expression, isForwardRef };
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16 | }
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17 | export function compileInjectable(meta, resolveForwardRefs) {
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18 | let result = null;
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19 | const factoryMeta = {
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20 | name: meta.name,
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21 | type: meta.type,
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22 | internalType: meta.internalType,
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23 | typeArgumentCount: meta.typeArgumentCount,
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24 | deps: [],
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25 | target: FactoryTarget.Injectable,
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26 | };
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27 | if (meta.useClass !== undefined) {
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28 | // meta.useClass has two modes of operation. Either deps are specified, in which case `new` is
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29 | // used to instantiate the class with dependencies injected, or deps are not specified and
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30 | // the factory of the class is used to instantiate it.
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31 | //
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32 | // A special case exists for useClass: Type where Type is the injectable type itself and no
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33 | // deps are specified, in which case 'useClass' is effectively ignored.
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34 | const useClassOnSelf = meta.useClass.expression.isEquivalent(meta.internalType);
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35 | let deps = undefined;
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36 | if (meta.deps !== undefined) {
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37 | deps = meta.deps;
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38 | }
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39 | if (deps !== undefined) {
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40 | // factory: () => new meta.useClass(...deps)
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41 | result = compileFactoryFunction(Object.assign(Object.assign({}, factoryMeta), { delegate: meta.useClass.expression, delegateDeps: deps, delegateType: R3FactoryDelegateType.Class }));
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42 | }
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43 | else if (useClassOnSelf) {
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44 | result = compileFactoryFunction(factoryMeta);
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45 | }
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46 | else {
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47 | result = {
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48 | statements: [],
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49 | expression: delegateToFactory(meta.type.value, meta.useClass.expression, resolveForwardRefs)
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50 | };
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51 | }
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52 | }
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53 | else if (meta.useFactory !== undefined) {
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54 | if (meta.deps !== undefined) {
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55 | result = compileFactoryFunction(Object.assign(Object.assign({}, factoryMeta), { delegate: meta.useFactory, delegateDeps: meta.deps || [], delegateType: R3FactoryDelegateType.Function }));
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56 | }
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57 | else {
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58 | result = {
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59 | statements: [],
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60 | expression: o.fn([], [new o.ReturnStatement(meta.useFactory.callFn([]))])
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61 | };
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62 | }
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63 | }
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64 | else if (meta.useValue !== undefined) {
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65 | // Note: it's safe to use `meta.useValue` instead of the `USE_VALUE in meta` check used for
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66 | // client code because meta.useValue is an Expression which will be defined even if the actual
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67 | // value is undefined.
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68 | result = compileFactoryFunction(Object.assign(Object.assign({}, factoryMeta), { expression: meta.useValue.expression }));
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69 | }
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70 | else if (meta.useExisting !== undefined) {
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71 | // useExisting is an `inject` call on the existing token.
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72 | result = compileFactoryFunction(Object.assign(Object.assign({}, factoryMeta), { expression: o.importExpr(Identifiers.inject).callFn([meta.useExisting.expression]) }));
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73 | }
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74 | else {
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75 | result = {
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76 | statements: [],
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77 | expression: delegateToFactory(meta.type.value, meta.internalType, resolveForwardRefs)
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78 | };
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79 | }
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80 | const token = meta.internalType;
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81 | const injectableProps = new DefinitionMap();
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82 | injectableProps.set('token', token);
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83 | injectableProps.set('factory', result.expression);
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84 | // Only generate providedIn property if it has a non-null value
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85 | if (meta.providedIn.expression.value !== null) {
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86 | injectableProps.set('providedIn', meta.providedIn.isForwardRef ? generateForwardRef(meta.providedIn.expression) :
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87 | meta.providedIn.expression);
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88 | }
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89 | const expression = o.importExpr(Identifiers.ɵɵdefineInjectable)
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90 | .callFn([injectableProps.toLiteralMap()], undefined, true);
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91 | return {
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92 | expression,
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93 | type: createInjectableType(meta),
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94 | statements: result.statements,
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95 | };
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96 | }
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97 | export function createInjectableType(meta) {
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98 | return new o.ExpressionType(o.importExpr(Identifiers.InjectableDeclaration, [typeWithParameters(meta.type.type, meta.typeArgumentCount)]));
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99 | }
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100 | function delegateToFactory(type, internalType, unwrapForwardRefs) {
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101 | if (type.node === internalType.node) {
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102 | // The types are the same, so we can simply delegate directly to the type's factory.
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103 | // ```
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104 | // factory: type.ɵfac
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105 | // ```
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106 | return internalType.prop('ɵfac');
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107 | }
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108 | if (!unwrapForwardRefs) {
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109 | // The type is not wrapped in a `forwardRef()`, so we create a simple factory function that
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110 | // accepts a sub-type as an argument.
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111 | // ```
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112 | // factory: function(t) { return internalType.ɵfac(t); }
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113 | // ```
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114 | return createFactoryFunction(internalType);
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115 | }
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116 | // The internalType is actually wrapped in a `forwardRef()` so we need to resolve that before
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117 | // calling its factory.
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118 | // ```
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119 | // factory: function(t) { return core.resolveForwardRef(type).ɵfac(t); }
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120 | // ```
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121 | const unwrappedType = o.importExpr(Identifiers.resolveForwardRef).callFn([internalType]);
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122 | return createFactoryFunction(unwrappedType);
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123 | }
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124 | function createFactoryFunction(type) {
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125 | return o.fn([new o.FnParam('t', o.DYNAMIC_TYPE)], [new o.ReturnStatement(type.callMethod('ɵfac', [o.variable('t')]))]);
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126 | }
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127 | //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport * as o from './output/output_ast';\nimport {generateForwardRef} from './render3/partial/util';\nimport {compileFactoryFunction, FactoryTarget, R3DependencyMetadata, R3FactoryDelegateType, R3FactoryMetadata} from './render3/r3_factory';\nimport {Identifiers} from './render3/r3_identifiers';\nimport {R3CompiledExpression, R3Reference, typeWithParameters} from './render3/util';\nimport {DefinitionMap} from './render3/view/util';\n\nexport interface R3InjectableMetadata {\n  name: string;\n  type: R3Reference;\n  internalType: o.Expression;\n  typeArgumentCount: number;\n  providedIn: R3ProviderExpression;\n  useClass?: R3ProviderExpression;\n  useFactory?: o.Expression;\n  useExisting?: R3ProviderExpression;\n  useValue?: R3ProviderExpression;\n  deps?: R3DependencyMetadata[];\n}\n\n/**\n * An expression used when instantiating an injectable.\n *\n * This is the type of the `useClass`, `useExisting` and `useValue` properties of\n * `R3InjectableMetadata` since those can refer to types that may eagerly reference types that have\n * not yet been defined.\n */\nexport interface R3ProviderExpression<T extends o.Expression = o.Expression> {\n  /**\n   * The expression that is used to instantiate the Injectable.\n   */\n  expression: T;\n  /**\n   * If true, then the `expression` contains a reference to something that has not yet been\n   * defined.\n   *\n   * This means that the expression must not be eagerly evaluated. Instead it must be wrapped in a\n   * function closure that will be evaluated lazily to allow the definition of the expression to be\n   * evaluated first.\n   *\n   * In some cases the expression will naturally be placed inside such a function closure, such as\n   * in a fully compiled factory function. In those case nothing more needs to be done.\n   *\n   * But in other cases, such as partial-compilation the expression will be located in top level\n   * code so will need to be wrapped in a function that is passed to a `forwardRef()` call.\n   */\n  isForwardRef: boolean;\n}\n\nexport function createR3ProviderExpression<T extends o.Expression>(\n    expression: T, isForwardRef: boolean): R3ProviderExpression<T> {\n  return {expression, isForwardRef};\n}\n\nexport function compileInjectable(\n    meta: R3InjectableMetadata, resolveForwardRefs: boolean): R3CompiledExpression {\n  let result: {expression: o.Expression, statements: o.Statement[]}|null = null;\n\n  const factoryMeta: R3FactoryMetadata = {\n    name: meta.name,\n    type: meta.type,\n    internalType: meta.internalType,\n    typeArgumentCount: meta.typeArgumentCount,\n    deps: [],\n    target: FactoryTarget.Injectable,\n  };\n\n  if (meta.useClass !== undefined) {\n    // meta.useClass has two modes of operation. Either deps are specified, in which case `new` is\n    // used to instantiate the class with dependencies injected, or deps are not specified and\n    // the factory of the class is used to instantiate it.\n    //\n    // A special case exists for useClass: Type where Type is the injectable type itself and no\n    // deps are specified, in which case 'useClass' is effectively ignored.\n\n    const useClassOnSelf = meta.useClass.expression.isEquivalent(meta.internalType);\n    let deps: R3DependencyMetadata[]|undefined = undefined;\n    if (meta.deps !== undefined) {\n      deps = meta.deps;\n    }\n\n    if (deps !== undefined) {\n      // factory: () => new meta.useClass(...deps)\n      result = compileFactoryFunction({\n        ...factoryMeta,\n        delegate: meta.useClass.expression,\n        delegateDeps: deps,\n        delegateType: R3FactoryDelegateType.Class,\n      });\n    } else if (useClassOnSelf) {\n      result = compileFactoryFunction(factoryMeta);\n    } else {\n      result = {\n        statements: [],\n        expression: delegateToFactory(\n            meta.type.value as o.WrappedNodeExpr<any>,\n            meta.useClass.expression as o.WrappedNodeExpr<any>, resolveForwardRefs)\n      };\n    }\n  } else if (meta.useFactory !== undefined) {\n    if (meta.deps !== undefined) {\n      result = compileFactoryFunction({\n        ...factoryMeta,\n        delegate: meta.useFactory,\n        delegateDeps: meta.deps || [],\n        delegateType: R3FactoryDelegateType.Function,\n      });\n    } else {\n      result = {\n        statements: [],\n        expression: o.fn([], [new o.ReturnStatement(meta.useFactory.callFn([]))])\n      };\n    }\n  } else if (meta.useValue !== undefined) {\n    // Note: it's safe to use `meta.useValue` instead of the `USE_VALUE in meta` check used for\n    // client code because meta.useValue is an Expression which will be defined even if the actual\n    // value is undefined.\n    result = compileFactoryFunction({\n      ...factoryMeta,\n      expression: meta.useValue.expression,\n    });\n  } else if (meta.useExisting !== undefined) {\n    // useExisting is an `inject` call on the existing token.\n    result = compileFactoryFunction({\n      ...factoryMeta,\n      expression: o.importExpr(Identifiers.inject).callFn([meta.useExisting.expression]),\n    });\n  } else {\n    result = {\n      statements: [],\n      expression: delegateToFactory(\n          meta.type.value as o.WrappedNodeExpr<any>, meta.internalType as o.WrappedNodeExpr<any>,\n          resolveForwardRefs)\n    };\n  }\n\n  const token = meta.internalType;\n\n  const injectableProps =\n      new DefinitionMap<{token: o.Expression, factory: o.Expression, providedIn: o.Expression}>();\n  injectableProps.set('token', token);\n  injectableProps.set('factory', result.expression);\n\n  // Only generate providedIn property if it has a non-null value\n  if ((meta.providedIn.expression as o.LiteralExpr).value !== null) {\n    injectableProps.set(\n        'providedIn',\n        meta.providedIn.isForwardRef ? generateForwardRef(meta.providedIn.expression) :\n                                       meta.providedIn.expression);\n  }\n\n  const expression = o.importExpr(Identifiers.ɵɵdefineInjectable)\n                         .callFn([injectableProps.toLiteralMap()], undefined, true);\n  return {\n    expression,\n    type: createInjectableType(meta),\n    statements: result.statements,\n  };\n}\n\nexport function createInjectableType(meta: R3InjectableMetadata) {\n  return new o.ExpressionType(o.importExpr(\n      Identifiers.InjectableDeclaration,\n      [typeWithParameters(meta.type.type, meta.typeArgumentCount)]));\n}\n\nfunction delegateToFactory(\n    type: o.WrappedNodeExpr<any>, internalType: o.WrappedNodeExpr<any>,\n    unwrapForwardRefs: boolean): o.Expression {\n  if (type.node === internalType.node) {\n    // The types are the same, so we can simply delegate directly to the type's factory.\n    // ```\n    // factory: type.ɵfac\n    // ```\n    return internalType.prop('ɵfac');\n  }\n\n  if (!unwrapForwardRefs) {\n    // The type is not wrapped in a `forwardRef()`, so we create a simple factory function that\n    // accepts a sub-type as an argument.\n    // ```\n    // factory: function(t) { return internalType.ɵfac(t); }\n    // ```\n    return createFactoryFunction(internalType);\n  }\n\n  // The internalType is actually wrapped in a `forwardRef()` so we need to resolve that before\n  // calling its factory.\n  // ```\n  // factory: function(t) { return core.resolveForwardRef(type).ɵfac(t); }\n  // ```\n  const unwrappedType = o.importExpr(Identifiers.resolveForwardRef).callFn([internalType]);\n  return createFactoryFunction(unwrappedType);\n}\n\nfunction createFactoryFunction(type: o.Expression): o.FunctionExpr {\n  return o.fn(\n      [new o.FnParam('t', o.DYNAMIC_TYPE)],\n      [new o.ReturnStatement(type.callMethod('ɵfac', [o.variable('t')]))]);\n}\n"]} |
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