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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const ConstDependency = require("./dependencies/ConstDependency");
/** @typedef {import("./Compiler")} Compiler */
/** @typedef {import("./javascript/JavascriptParser")} JavascriptParser */
const nestedWebpackRequireTag = Symbol("nested __webpack_require__");
class CompatibilityPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap(
"CompatibilityPlugin",
(compilation, { normalModuleFactory }) => {
compilation.dependencyTemplates.set(
ConstDependency,
new ConstDependency.Template()
);
normalModuleFactory.hooks.parser
.for("javascript/auto")
.tap("CompatibilityPlugin", (parser, parserOptions) => {
if (
parserOptions.browserify !== undefined &&
!parserOptions.browserify
)
return;
parser.hooks.call
.for("require")
.tap("CompatibilityPlugin", expr => {
// support for browserify style require delegator: "require(o, !0)"
if (expr.arguments.length !== 2) return;
const second = parser.evaluateExpression(expr.arguments[1]);
if (!second.isBoolean()) return;
if (second.asBool() !== true) return;
const dep = new ConstDependency("require", expr.callee.range);
dep.loc = expr.loc;
if (parser.state.current.dependencies.length > 0) {
const last =
parser.state.current.dependencies[
parser.state.current.dependencies.length - 1
];
if (
last.critical &&
last.options &&
last.options.request === "." &&
last.userRequest === "." &&
last.options.recursive
)
parser.state.current.dependencies.pop();
}
parser.state.module.addPresentationalDependency(dep);
return true;
});
});
/**
* @param {JavascriptParser} parser the parser
* @returns {void}
*/
const handler = parser => {
// Handle nested requires
parser.hooks.preStatement.tap("CompatibilityPlugin", statement => {
if (
statement.type === "FunctionDeclaration" &&
statement.id &&
statement.id.name === "__webpack_require__"
) {
const newName = `__nested_webpack_require_${statement.range[0]}__`;
parser.tagVariable(statement.id.name, nestedWebpackRequireTag, {
name: newName,
declaration: {
updated: false,
loc: statement.id.loc,
range: statement.id.range
}
});
return true;
}
});
parser.hooks.pattern
.for("__webpack_require__")
.tap("CompatibilityPlugin", pattern => {
const newName = `__nested_webpack_require_${pattern.range[0]}__`;
parser.tagVariable(pattern.name, nestedWebpackRequireTag, {
name: newName,
declaration: {
updated: false,
loc: pattern.loc,
range: pattern.range
}
});
return true;
});
parser.hooks.expression
.for(nestedWebpackRequireTag)
.tap("CompatibilityPlugin", expr => {
const { name, declaration } = parser.currentTagData;
if (!declaration.updated) {
const dep = new ConstDependency(name, declaration.range);
dep.loc = declaration.loc;
parser.state.module.addPresentationalDependency(dep);
declaration.updated = true;
}
const dep = new ConstDependency(name, expr.range);
dep.loc = expr.loc;
parser.state.module.addPresentationalDependency(dep);
return true;
});
// Handle hashbang
parser.hooks.program.tap(
"CompatibilityPlugin",
(program, comments) => {
if (comments.length === 0) return;
const c = comments[0];
if (c.type === "Line" && c.range[0] === 0) {
if (parser.state.source.slice(0, 2).toString() !== "#!") return;
// this is a hashbang comment
const dep = new ConstDependency("//", 0);
dep.loc = c.loc;
parser.state.module.addPresentationalDependency(dep);
}
}
);
};
normalModuleFactory.hooks.parser
.for("javascript/auto")
.tap("CompatibilityPlugin", handler);
normalModuleFactory.hooks.parser
.for("javascript/dynamic")
.tap("CompatibilityPlugin", handler);
normalModuleFactory.hooks.parser
.for("javascript/esm")
.tap("CompatibilityPlugin", handler);
}
);
}
}
module.exports = CompatibilityPlugin;