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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Ivan Kopeykin @vankop
*/
"use strict";
const { pathToFileURL } = require("url");
const ModuleDependencyWarning = require("../ModuleDependencyWarning");
const {
JAVASCRIPT_MODULE_TYPE_AUTO,
JAVASCRIPT_MODULE_TYPE_ESM
} = require("../ModuleTypeConstants");
const Template = require("../Template");
const BasicEvaluatedExpression = require("../javascript/BasicEvaluatedExpression");
const {
evaluateToIdentifier,
evaluateToNumber,
evaluateToString,
toConstantDependency
} = require("../javascript/JavascriptParserHelpers");
const memoize = require("../util/memoize");
const propertyAccess = require("../util/propertyAccess");
const ConstDependency = require("./ConstDependency");
/** @typedef {import("estree").MemberExpression} MemberExpression */
/** @typedef {import("../../declarations/WebpackOptions").JavascriptParserOptions} JavascriptParserOptions */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Dependency").DependencyLocation} DependencyLocation */
/** @typedef {import("../NormalModule")} NormalModule */
/** @typedef {import("../javascript/JavascriptParser")} Parser */
/** @typedef {import("../javascript/JavascriptParser").Range} Range */
const getCriticalDependencyWarning = memoize(() =>
require("./CriticalDependencyWarning")
);
const PLUGIN_NAME = "ImportMetaPlugin";
class ImportMetaPlugin {
/**
* @param {Compiler} compiler compiler
*/
apply(compiler) {
compiler.hooks.compilation.tap(
PLUGIN_NAME,
(compilation, { normalModuleFactory }) => {
/**
* @param {NormalModule} module module
* @returns {string} file url
*/
const getUrl = module => pathToFileURL(module.resource).toString();
/**
* @param {Parser} parser parser parser
* @param {JavascriptParserOptions} parserOptions parserOptions
* @returns {void}
*/
const parserHandler = (parser, { importMeta }) => {
if (importMeta === false) {
const { importMetaName } = compilation.outputOptions;
if (importMetaName === "import.meta") return;
parser.hooks.expression
.for("import.meta")
.tap(PLUGIN_NAME, metaProperty => {
const dep = new ConstDependency(
/** @type {string} */ (importMetaName),
/** @type {Range} */ (metaProperty.range)
);
dep.loc = /** @type {DependencyLocation} */ (metaProperty.loc);
parser.state.module.addPresentationalDependency(dep);
return true;
});
return;
}
// import.meta direct
const webpackVersion = Number.parseInt(
require("../../package.json").version,
10
);
const importMetaUrl = () =>
JSON.stringify(getUrl(parser.state.module));
const importMetaWebpackVersion = () => JSON.stringify(webpackVersion);
/**
* @param {string[]} members members
* @returns {string} error message
*/
const importMetaUnknownProperty = members =>
`${Template.toNormalComment(
`unsupported import.meta.${members.join(".")}`
)} undefined${propertyAccess(members, 1)}`;
parser.hooks.typeof
.for("import.meta")
.tap(
PLUGIN_NAME,
toConstantDependency(parser, JSON.stringify("object"))
);
parser.hooks.expression
.for("import.meta")
.tap(PLUGIN_NAME, metaProperty => {
const referencedPropertiesInDestructuring =
parser.destructuringAssignmentPropertiesFor(metaProperty);
if (!referencedPropertiesInDestructuring) {
const CriticalDependencyWarning =
getCriticalDependencyWarning();
parser.state.module.addWarning(
new ModuleDependencyWarning(
parser.state.module,
new CriticalDependencyWarning(
"Accessing import.meta directly is unsupported (only property access or destructuring is supported)"
),
/** @type {DependencyLocation} */ (metaProperty.loc)
)
);
const dep = new ConstDependency(
`${
parser.isAsiPosition(
/** @type {Range} */ (metaProperty.range)[0]
)
? ";"
: ""
}({})`,
/** @type {Range} */ (metaProperty.range)
);
dep.loc = /** @type {DependencyLocation} */ (metaProperty.loc);
parser.state.module.addPresentationalDependency(dep);
return true;
}
let str = "";
for (const { id: prop } of referencedPropertiesInDestructuring) {
switch (prop) {
case "url":
str += `url: ${importMetaUrl()},`;
break;
case "webpack":
str += `webpack: ${importMetaWebpackVersion()},`;
break;
default:
str += `[${JSON.stringify(
prop
)}]: ${importMetaUnknownProperty([prop])},`;
break;
}
}
const dep = new ConstDependency(
`({${str}})`,
/** @type {Range} */ (metaProperty.range)
);
dep.loc = /** @type {DependencyLocation} */ (metaProperty.loc);
parser.state.module.addPresentationalDependency(dep);
return true;
});
parser.hooks.evaluateTypeof
.for("import.meta")
.tap(PLUGIN_NAME, evaluateToString("object"));
parser.hooks.evaluateIdentifier.for("import.meta").tap(
PLUGIN_NAME,
evaluateToIdentifier("import.meta", "import.meta", () => [], true)
);
// import.meta.url
parser.hooks.typeof
.for("import.meta.url")
.tap(
PLUGIN_NAME,
toConstantDependency(parser, JSON.stringify("string"))
);
parser.hooks.expression
.for("import.meta.url")
.tap(PLUGIN_NAME, expr => {
const dep = new ConstDependency(
importMetaUrl(),
/** @type {Range} */ (expr.range)
);
dep.loc = /** @type {DependencyLocation} */ (expr.loc);
parser.state.module.addPresentationalDependency(dep);
return true;
});
parser.hooks.evaluateTypeof
.for("import.meta.url")
.tap(PLUGIN_NAME, evaluateToString("string"));
parser.hooks.evaluateIdentifier
.for("import.meta.url")
.tap(PLUGIN_NAME, expr =>
new BasicEvaluatedExpression()
.setString(getUrl(parser.state.module))
.setRange(/** @type {Range} */ (expr.range))
);
// import.meta.webpack
parser.hooks.typeof
.for("import.meta.webpack")
.tap(
PLUGIN_NAME,
toConstantDependency(parser, JSON.stringify("number"))
);
parser.hooks.expression
.for("import.meta.webpack")
.tap(
PLUGIN_NAME,
toConstantDependency(parser, importMetaWebpackVersion())
);
parser.hooks.evaluateTypeof
.for("import.meta.webpack")
.tap(PLUGIN_NAME, evaluateToString("number"));
parser.hooks.evaluateIdentifier
.for("import.meta.webpack")
.tap(PLUGIN_NAME, evaluateToNumber(webpackVersion));
// Unknown properties
parser.hooks.unhandledExpressionMemberChain
.for("import.meta")
.tap(PLUGIN_NAME, (expr, members) => {
const dep = new ConstDependency(
importMetaUnknownProperty(members),
/** @type {Range} */ (expr.range)
);
dep.loc = /** @type {DependencyLocation} */ (expr.loc);
parser.state.module.addPresentationalDependency(dep);
return true;
});
parser.hooks.evaluate
.for("MemberExpression")
.tap(PLUGIN_NAME, expression => {
const expr = /** @type {MemberExpression} */ (expression);
if (
expr.object.type === "MetaProperty" &&
expr.object.meta.name === "import" &&
expr.object.property.name === "meta" &&
expr.property.type ===
(expr.computed ? "Literal" : "Identifier")
) {
return new BasicEvaluatedExpression()
.setUndefined()
.setRange(/** @type {Range} */ (expr.range));
}
});
};
normalModuleFactory.hooks.parser
.for(JAVASCRIPT_MODULE_TYPE_AUTO)
.tap(PLUGIN_NAME, parserHandler);
normalModuleFactory.hooks.parser
.for(JAVASCRIPT_MODULE_TYPE_ESM)
.tap(PLUGIN_NAME, parserHandler);
}
);
}
}
module.exports = ImportMetaPlugin;