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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const RuntimeGlobals = require("./RuntimeGlobals");
const WebpackError = require("./WebpackError");
const ConstDependency = require("./dependencies/ConstDependency");
const BasicEvaluatedExpression = require("./javascript/BasicEvaluatedExpression");
const {
evaluateToString,
toConstantDependency
} = require("./javascript/JavascriptParserHelpers");
const { provide } = require("./util/MapHelpers");
/** @typedef {import("estree").Expression} Expression */
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./NormalModule")} NormalModule */
/** @typedef {import("./RuntimeTemplate")} RuntimeTemplate */
/** @typedef {import("./javascript/JavascriptParser")} JavascriptParser */
/** @typedef {null|undefined|RegExp|Function|string|number|boolean|bigint|undefined} CodeValuePrimitive */
/** @typedef {RecursiveArrayOrRecord<CodeValuePrimitive|RuntimeValue>} CodeValue */
/**
* @typedef {Object} RuntimeValueOptions
* @property {string[]=} fileDependencies
* @property {string[]=} contextDependencies
* @property {string[]=} missingDependencies
* @property {string[]=} buildDependencies
* @property {string|function(): string=} version
*/
class RuntimeValue {
/**
* @param {function({ module: NormalModule, key: string, readonly version: string | undefined }): CodeValuePrimitive} fn generator function
* @param {true | string[] | RuntimeValueOptions=} options options
*/
constructor(fn, options) {
this.fn = fn;
if (Array.isArray(options)) {
options = {
fileDependencies: options
};
}
this.options = options || {};
}
get fileDependencies() {
return this.options === true ? true : this.options.fileDependencies;
}
/**
* @param {JavascriptParser} parser the parser
* @param {Map<string, string | Set<string>>} valueCacheVersions valueCacheVersions
* @param {string} key the defined key
* @returns {CodeValuePrimitive} code
*/
exec(parser, valueCacheVersions, key) {
const buildInfo = parser.state.module.buildInfo;
if (this.options === true) {
buildInfo.cacheable = false;
} else {
if (this.options.fileDependencies) {
for (const dep of this.options.fileDependencies) {
buildInfo.fileDependencies.add(dep);
}
}
if (this.options.contextDependencies) {
for (const dep of this.options.contextDependencies) {
buildInfo.contextDependencies.add(dep);
}
}
if (this.options.missingDependencies) {
for (const dep of this.options.missingDependencies) {
buildInfo.missingDependencies.add(dep);
}
}
if (this.options.buildDependencies) {
for (const dep of this.options.buildDependencies) {
buildInfo.buildDependencies.add(dep);
}
}
}
return this.fn({
module: parser.state.module,
key,
get version() {
return /** @type {string} */ (
valueCacheVersions.get(VALUE_DEP_PREFIX + key)
);
}
});
}
getCacheVersion() {
return this.options === true
? undefined
: (typeof this.options.version === "function"
? this.options.version()
: this.options.version) || "unset";
}
}
/**
* @param {any[]|{[k: string]: any}} obj obj
* @param {JavascriptParser} parser Parser
* @param {Map<string, string | Set<string>>} valueCacheVersions valueCacheVersions
* @param {string} key the defined key
* @param {RuntimeTemplate} runtimeTemplate the runtime template
* @param {boolean|undefined|null=} asiSafe asi safe (undefined: unknown, null: unneeded)
* @returns {string} code converted to string that evaluates
*/
const stringifyObj = (
obj,
parser,
valueCacheVersions,
key,
runtimeTemplate,
asiSafe
) => {
let code;
let arr = Array.isArray(obj);
if (arr) {
code = `[${obj
.map(code =>
toCode(code, parser, valueCacheVersions, key, runtimeTemplate, null)
)
.join(",")}]`;
} else {
code = `{${Object.keys(obj)
.map(key => {
const code = obj[key];
return (
JSON.stringify(key) +
":" +
toCode(code, parser, valueCacheVersions, key, runtimeTemplate, null)
);
})
.join(",")}}`;
}
switch (asiSafe) {
case null:
return code;
case true:
return arr ? code : `(${code})`;
case false:
return arr ? `;${code}` : `;(${code})`;
default:
return `Object(${code})`;
}
};
/**
* Convert code to a string that evaluates
* @param {CodeValue} code Code to evaluate
* @param {JavascriptParser} parser Parser
* @param {Map<string, string | Set<string>>} valueCacheVersions valueCacheVersions
* @param {string} key the defined key
* @param {RuntimeTemplate} runtimeTemplate the runtime template
* @param {boolean|undefined|null=} asiSafe asi safe (undefined: unknown, null: unneeded)
* @returns {string} code converted to string that evaluates
*/
const toCode = (
code,
parser,
valueCacheVersions,
key,
runtimeTemplate,
asiSafe
) => {
if (code === null) {
return "null";
}
if (code === undefined) {
return "undefined";
}
if (Object.is(code, -0)) {
return "-0";
}
if (code instanceof RuntimeValue) {
return toCode(
code.exec(parser, valueCacheVersions, key),
parser,
valueCacheVersions,
key,
runtimeTemplate,
asiSafe
);
}
if (code instanceof RegExp && code.toString) {
return code.toString();
}
if (typeof code === "function" && code.toString) {
return "(" + code.toString() + ")";
}
if (typeof code === "object") {
return stringifyObj(
code,
parser,
valueCacheVersions,
key,
runtimeTemplate,
asiSafe
);
}
if (typeof code === "bigint") {
return runtimeTemplate.supportsBigIntLiteral()
? `${code}n`
: `BigInt("${code}")`;
}
return code + "";
};
const toCacheVersion = code => {
if (code === null) {
return "null";
}
if (code === undefined) {
return "undefined";
}
if (Object.is(code, -0)) {
return "-0";
}
if (code instanceof RuntimeValue) {
return code.getCacheVersion();
}
if (code instanceof RegExp && code.toString) {
return code.toString();
}
if (typeof code === "function" && code.toString) {
return "(" + code.toString() + ")";
}
if (typeof code === "object") {
const items = Object.keys(code).map(key => ({
key,
value: toCacheVersion(code[key])
}));
if (items.some(({ value }) => value === undefined)) return undefined;
return `{${items.map(({ key, value }) => `${key}: ${value}`).join(", ")}}`;
}
if (typeof code === "bigint") {
return `${code}n`;
}
return code + "";
};
const VALUE_DEP_PREFIX = "webpack/DefinePlugin ";
const VALUE_DEP_MAIN = "webpack/DefinePlugin";
class DefinePlugin {
/**
* Create a new define plugin
* @param {Record<string, CodeValue>} definitions A map of global object definitions
*/
constructor(definitions) {
this.definitions = definitions;
}
/**
* @param {function({ module: NormalModule, key: string, readonly version: string | undefined }): CodeValuePrimitive} fn generator function
* @param {true | string[] | RuntimeValueOptions=} options options
* @returns {RuntimeValue} runtime value
*/
static runtimeValue(fn, options) {
return new RuntimeValue(fn, options);
}
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
const definitions = this.definitions;
compiler.hooks.compilation.tap(
"DefinePlugin",
(compilation, { normalModuleFactory }) => {
compilation.dependencyTemplates.set(
ConstDependency,
new ConstDependency.Template()
);
const { runtimeTemplate } = compilation;
const mainValue = /** @type {Set<string>} */ (
provide(
compilation.valueCacheVersions,
VALUE_DEP_MAIN,
() => new Set()
)
);
/**
* Handler
* @param {JavascriptParser} parser Parser
* @returns {void}
*/
const handler = parser => {
parser.hooks.program.tap("DefinePlugin", () => {
const { buildInfo } = parser.state.module;
if (!buildInfo.valueDependencies)
buildInfo.valueDependencies = new Map();
buildInfo.valueDependencies.set(VALUE_DEP_MAIN, mainValue);
});
const addValueDependency = key => {
const { buildInfo } = parser.state.module;
buildInfo.valueDependencies.set(
VALUE_DEP_PREFIX + key,
compilation.valueCacheVersions.get(VALUE_DEP_PREFIX + key)
);
};
const withValueDependency =
(key, fn) =>
(...args) => {
addValueDependency(key);
return fn(...args);
};
/**
* Walk definitions
* @param {Object} definitions Definitions map
* @param {string} prefix Prefix string
* @returns {void}
*/
const walkDefinitions = (definitions, prefix) => {
Object.keys(definitions).forEach(key => {
const code = definitions[key];
if (
code &&
typeof code === "object" &&
!(code instanceof RuntimeValue) &&
!(code instanceof RegExp)
) {
walkDefinitions(code, prefix + key + ".");
applyObjectDefine(prefix + key, code);
return;
}
applyDefineKey(prefix, key);
applyDefine(prefix + key, code);
});
};
/**
* Apply define key
* @param {string} prefix Prefix
* @param {string} key Key
* @returns {void}
*/
const applyDefineKey = (prefix, key) => {
const splittedKey = key.split(".");
splittedKey.slice(1).forEach((_, i) => {
const fullKey = prefix + splittedKey.slice(0, i + 1).join(".");
parser.hooks.canRename.for(fullKey).tap("DefinePlugin", () => {
addValueDependency(key);
return true;
});
});
};
/**
* Apply Code
* @param {string} key Key
* @param {CodeValue} code Code
* @returns {void}
*/
const applyDefine = (key, code) => {
const originalKey = key;
const isTypeof = /^typeof\s+/.test(key);
if (isTypeof) key = key.replace(/^typeof\s+/, "");
let recurse = false;
let recurseTypeof = false;
if (!isTypeof) {
parser.hooks.canRename.for(key).tap("DefinePlugin", () => {
addValueDependency(originalKey);
return true;
});
parser.hooks.evaluateIdentifier
.for(key)
.tap("DefinePlugin", expr => {
/**
* this is needed in case there is a recursion in the DefinePlugin
* to prevent an endless recursion
* e.g.: new DefinePlugin({
* "a": "b",
* "b": "a"
* });
*/
if (recurse) return;
addValueDependency(originalKey);
recurse = true;
const res = parser.evaluate(
toCode(
code,
parser,
compilation.valueCacheVersions,
key,
runtimeTemplate,
null
)
);
recurse = false;
res.setRange(expr.range);
return res;
});
parser.hooks.expression.for(key).tap("DefinePlugin", expr => {
addValueDependency(originalKey);
const strCode = toCode(
code,
parser,
compilation.valueCacheVersions,
originalKey,
runtimeTemplate,
!parser.isAsiPosition(expr.range[0])
);
if (/__webpack_require__\s*(!?\.)/.test(strCode)) {
return toConstantDependency(parser, strCode, [
RuntimeGlobals.require
])(expr);
} else if (/__webpack_require__/.test(strCode)) {
return toConstantDependency(parser, strCode, [
RuntimeGlobals.requireScope
])(expr);
} else {
return toConstantDependency(parser, strCode)(expr);
}
});
}
parser.hooks.evaluateTypeof.for(key).tap("DefinePlugin", expr => {
/**
* this is needed in case there is a recursion in the DefinePlugin
* to prevent an endless recursion
* e.g.: new DefinePlugin({
* "typeof a": "typeof b",
* "typeof b": "typeof a"
* });
*/
if (recurseTypeof) return;
recurseTypeof = true;
addValueDependency(originalKey);
const codeCode = toCode(
code,
parser,
compilation.valueCacheVersions,
originalKey,
runtimeTemplate,
null
);
const typeofCode = isTypeof
? codeCode
: "typeof (" + codeCode + ")";
const res = parser.evaluate(typeofCode);
recurseTypeof = false;
res.setRange(expr.range);
return res;
});
parser.hooks.typeof.for(key).tap("DefinePlugin", expr => {
addValueDependency(originalKey);
const codeCode = toCode(
code,
parser,
compilation.valueCacheVersions,
originalKey,
runtimeTemplate,
null
);
const typeofCode = isTypeof
? codeCode
: "typeof (" + codeCode + ")";
const res = parser.evaluate(typeofCode);
if (!res.isString()) return;
return toConstantDependency(
parser,
JSON.stringify(res.string)
).bind(parser)(expr);
});
};
/**
* Apply Object
* @param {string} key Key
* @param {Object} obj Object
* @returns {void}
*/
const applyObjectDefine = (key, obj) => {
parser.hooks.canRename.for(key).tap("DefinePlugin", () => {
addValueDependency(key);
return true;
});
parser.hooks.evaluateIdentifier
.for(key)
.tap("DefinePlugin", expr => {
addValueDependency(key);
return new BasicEvaluatedExpression()
.setTruthy()
.setSideEffects(false)
.setRange(expr.range);
});
parser.hooks.evaluateTypeof
.for(key)
.tap(
"DefinePlugin",
withValueDependency(key, evaluateToString("object"))
);
parser.hooks.expression.for(key).tap("DefinePlugin", expr => {
addValueDependency(key);
const strCode = stringifyObj(
obj,
parser,
compilation.valueCacheVersions,
key,
runtimeTemplate,
!parser.isAsiPosition(expr.range[0])
);
if (/__webpack_require__\s*(!?\.)/.test(strCode)) {
return toConstantDependency(parser, strCode, [
RuntimeGlobals.require
])(expr);
} else if (/__webpack_require__/.test(strCode)) {
return toConstantDependency(parser, strCode, [
RuntimeGlobals.requireScope
])(expr);
} else {
return toConstantDependency(parser, strCode)(expr);
}
});
parser.hooks.typeof
.for(key)
.tap(
"DefinePlugin",
withValueDependency(
key,
toConstantDependency(parser, JSON.stringify("object"))
)
);
};
walkDefinitions(definitions, "");
};
normalModuleFactory.hooks.parser
.for("javascript/auto")
.tap("DefinePlugin", handler);
normalModuleFactory.hooks.parser
.for("javascript/dynamic")
.tap("DefinePlugin", handler);
normalModuleFactory.hooks.parser
.for("javascript/esm")
.tap("DefinePlugin", handler);
/**
* Walk definitions
* @param {Object} definitions Definitions map
* @param {string} prefix Prefix string
* @returns {void}
*/
const walkDefinitionsForValues = (definitions, prefix) => {
Object.keys(definitions).forEach(key => {
const code = definitions[key];
const version = toCacheVersion(code);
const name = VALUE_DEP_PREFIX + prefix + key;
mainValue.add(name);
const oldVersion = compilation.valueCacheVersions.get(name);
if (oldVersion === undefined) {
compilation.valueCacheVersions.set(name, version);
} else if (oldVersion !== version) {
const warning = new WebpackError(
`DefinePlugin\nConflicting values for '${prefix + key}'`
);
warning.details = `'${oldVersion}' !== '${version}'`;
warning.hideStack = true;
compilation.warnings.push(warning);
}
if (
code &&
typeof code === "object" &&
!(code instanceof RuntimeValue) &&
!(code instanceof RegExp)
) {
walkDefinitionsForValues(code, prefix + key + ".");
}
});
};
walkDefinitionsForValues(definitions, "");
}
);
}
}
module.exports = DefinePlugin;