Index: frontend/node_modules/es-abstract/eslint.config.mjs
===================================================================
--- frontend/node_modules/es-abstract/eslint.config.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
+++ frontend/node_modules/es-abstract/eslint.config.mjs	(revision 9af201e94b5a79beb92a30858fc54de4bc3b9449)
@@ -0,0 +1,129 @@
+import ljharb from '@ljharb/eslint-config/flat';
+import ljharbNodeLatest from '@ljharb/eslint-config/flat/node/latest';
+import ljharbTests from '@ljharb/eslint-config/flat/tests';
+
+export default [
+	{
+		ignores: [
+			'.nyc_output',
+		],
+	},
+	...ljharb,
+	{
+		languageOptions: {
+			globals: {
+				DataView: false,
+				Float16Array: false,
+				Float32Array: false,
+				Float64Array: false,
+				Int8Array: false,
+				Int16Array: false,
+				Int32Array: false,
+				Intl: false,
+				Uint8Array: false,
+				Uint8ClampedArray: false,
+				Uint16Array: false,
+				Uint32Array: false,
+			},
+		},
+		rules: {
+			'array-bracket-newline': 'off',
+			complexity: 'off',
+			eqeqeq: ['error', 'allow-null'],
+			'func-name-matching': 'off',
+			'id-length': ['error', { min: 1, max: 40 }],
+			'max-lines-per-function': 'warn',
+			'max-params': ['error', 5],
+			'max-statements': 'warn',
+			'max-statements-per-line': ['error', { max: 2 }],
+			'multiline-comment-style': 'off',
+			'new-cap': 'off',
+			'no-extra-parens': 'warn',
+			'no-implicit-coercion': ['error', {
+				boolean: false,
+				number: false,
+				string: true,
+			}],
+			'no-magic-numbers': 'off',
+			'sort-keys': 'off',
+		},
+	},
+	{
+		files: ['GetIntrinsic.js'],
+		rules: {
+			'max-statements': 'off',
+		},
+	},
+	{
+		files: ['operations/*'],
+		rules: {
+			'max-lines': 'off',
+		},
+	},
+	...ljharbNodeLatest
+		.filter((c) => !c.files?.some((f) => typeof f === 'function' || f === '**/*.mjs'))
+		.map((c) => ({
+			...c,
+			files: [
+				'operations/deltas.js',
+				'operations/getOps.js',
+				'operations/spackle.js',
+				'operations/years.js',
+			],
+		})),
+	{
+		files: [
+			'operations/deltas.js',
+			'operations/getOps.js',
+			'operations/spackle.js',
+			'operations/years.js',
+		],
+		rules: {
+			complexity: 'off',
+			'func-style': 'off',
+			'max-lines-per-function': 'off',
+			'max-nested-callbacks': 'off',
+			'max-statements': 'off',
+			'no-magic-numbers': 'off',
+			'no-throw-literal': 'off',
+		},
+	},
+	...ljharbTests.map((c) => ({
+		...c,
+		files: ['test/**'],
+	})),
+	{
+		files: ['test/**'],
+		rules: {
+			'max-len': 'off',
+			'max-lines-per-function': 'off',
+			'no-implicit-coercion': 'off',
+			'no-invalid-this': 'warn',
+			'prefer-promise-reject-errors': 'off',
+		},
+	},
+	{
+		files: [
+			'*/Num*ToRawBytes.js',
+			'*/RawBytesToNum*.js',
+			'helpers/bytesAs*.js',
+			'helpers/valueToFloat*.js',
+		],
+		rules: {
+			'max-lines-per-function': 'off',
+			'max-statements': 'off',
+			'no-redeclare': 'warn',
+			'operator-linebreak': ['error', 'before', {
+				overrides: {
+					'=': 'none',
+				},
+			}],
+		},
+	},
+	{
+		files: ['*/GetSubstitution.js'],
+		rules: {
+			'max-depth': 'off',
+		},
+	},
+];