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webpack.js
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/* MIT License http://www.opensource.org/licenses/mit-license.php Author Tobias Koppers @sokra */ "use strict"; const CachedConstDependency = require("./dependencies/CachedConstDependency"); const ConstDependency = require("./dependencies/ConstDependency"); const { evaluateToString } = require("./javascript/JavascriptParserHelpers"); const { parseResource } = require("./util/identifier"); /** @typedef {import("estree").Expression} ExpressionNode */ /** @typedef {import("estree").Super} SuperNode */ /** @typedef {import("./Compiler")} Compiler */ const collectDeclaration = (declarations, pattern) => { const stack = [pattern]; while (stack.length > 0) { const node = stack.pop(); switch (node.type) { case "Identifier": declarations.add(node.name); break; case "ArrayPattern": for (const element of node.elements) { if (element) { stack.push(element); } } break; case "AssignmentPattern": stack.push(node.left); break; case "ObjectPattern": for (const property of node.properties) { stack.push(property.value); } break; case "RestElement": stack.push(node.argument); break; } } }; const getHoistedDeclarations = (branch, includeFunctionDeclarations) => { const declarations = new Set(); const stack = [branch]; while (stack.length > 0) { const node = stack.pop(); // Some node could be `null` or `undefined`. if (!node) continue; switch (node.type) { // Walk through control statements to look for hoisted declarations. // Some branches are skipped since they do not allow declarations. case "BlockStatement": for (const stmt of node.body) { stack.push(stmt); } break; case "IfStatement": stack.push(node.consequent); stack.push(node.alternate); break; case "ForStatement": stack.push(node.init); stack.push(node.body); break; case "ForInStatement": case "ForOfStatement": stack.push(node.left); stack.push(node.body); break; case "DoWhileStatement": case "WhileStatement": case "LabeledStatement": stack.push(node.body); break; case "SwitchStatement": for (const cs of node.cases) { for (const consequent of cs.consequent) { stack.push(consequent); } } break; case "TryStatement": stack.push(node.block); if (node.handler) { stack.push(node.handler.body); } stack.push(node.finalizer); break; case "FunctionDeclaration": if (includeFunctionDeclarations) { collectDeclaration(declarations, node.id); } break; case "VariableDeclaration": if (node.kind === "var") { for (const decl of node.declarations) { collectDeclaration(declarations, decl.id); } } break; } } return Array.from(declarations); }; class ConstPlugin { /** * Apply the plugin * @param {Compiler} compiler the compiler instance * @returns {void} */ apply(compiler) { const cachedParseResource = parseResource.bindCache(compiler.root); compiler.hooks.compilation.tap( "ConstPlugin", (compilation, { normalModuleFactory }) => { compilation.dependencyTemplates.set( ConstDependency, new ConstDependency.Template() ); compilation.dependencyTemplates.set( CachedConstDependency, new CachedConstDependency.Template() ); const handler = parser => { parser.hooks.statementIf.tap("ConstPlugin", statement => { if (parser.scope.isAsmJs) return; const param = parser.evaluateExpression(statement.test); const bool = param.asBool(); if (typeof bool === "boolean") { if (!param.couldHaveSideEffects()) { const dep = new ConstDependency(`${bool}`, param.range); dep.loc = statement.loc; parser.state.module.addPresentationalDependency(dep); } else { parser.walkExpression(statement.test); } const branchToRemove = bool ? statement.alternate : statement.consequent; if (branchToRemove) { // Before removing the dead branch, the hoisted declarations // must be collected. // // Given the following code: // // if (true) f() else g() // if (false) { // function f() {} // const g = function g() {} // if (someTest) { // let a = 1 // var x, {y, z} = obj // } // } else { // … // } // // the generated code is: // // if (true) f() else {} // if (false) { // var f, x, y, z; (in loose mode) // var x, y, z; (in strict mode) // } else { // … // } // // NOTE: When code runs in strict mode, `var` declarations // are hoisted but `function` declarations don't. // let declarations; if (parser.scope.isStrict) { // If the code runs in strict mode, variable declarations // using `var` must be hoisted. declarations = getHoistedDeclarations(branchToRemove, false); } else { // Otherwise, collect all hoisted declaration. declarations = getHoistedDeclarations(branchToRemove, true); } let replacement; if (declarations.length > 0) { replacement = `{ var ${declarations.join(", ")}; }`; } else { replacement = "{}"; } const dep = new ConstDependency( replacement, branchToRemove.range ); dep.loc = branchToRemove.loc; parser.state.module.addPresentationalDependency(dep); } return bool; } }); parser.hooks.expressionConditionalOperator.tap( "ConstPlugin", expression => { if (parser.scope.isAsmJs) return; const param = parser.evaluateExpression(expression.test); const bool = param.asBool(); if (typeof bool === "boolean") { if (!param.couldHaveSideEffects()) { const dep = new ConstDependency(` ${bool}`, param.range); dep.loc = expression.loc; parser.state.module.addPresentationalDependency(dep); } else { parser.walkExpression(expression.test); } // Expressions do not hoist. // It is safe to remove the dead branch. // // Given the following code: // // false ? someExpression() : otherExpression(); // // the generated code is: // // false ? 0 : otherExpression(); // const branchToRemove = bool ? expression.alternate : expression.consequent; const dep = new ConstDependency("0", branchToRemove.range); dep.loc = branchToRemove.loc; parser.state.module.addPresentationalDependency(dep); return bool; } } ); parser.hooks.expressionLogicalOperator.tap( "ConstPlugin", expression => { if (parser.scope.isAsmJs) return; if ( expression.operator === "&&" || expression.operator === "||" ) { const param = parser.evaluateExpression(expression.left); const bool = param.asBool(); if (typeof bool === "boolean") { // Expressions do not hoist. // It is safe to remove the dead branch. // // ------------------------------------------ // // Given the following code: // // falsyExpression() && someExpression(); // // the generated code is: // // falsyExpression() && false; // // ------------------------------------------ // // Given the following code: // // truthyExpression() && someExpression(); // // the generated code is: // // true && someExpression(); // // ------------------------------------------ // // Given the following code: // // truthyExpression() || someExpression(); // // the generated code is: // // truthyExpression() || false; // // ------------------------------------------ // // Given the following code: // // falsyExpression() || someExpression(); // // the generated code is: // // false && someExpression(); // const keepRight = (expression.operator === "&&" && bool) || (expression.operator === "||" && !bool); if ( !param.couldHaveSideEffects() && (param.isBoolean() || keepRight) ) { // for case like // // return'development'===process.env.NODE_ENV&&'foo' // // we need a space before the bool to prevent result like // // returnfalse&&'foo' // const dep = new ConstDependency(` ${bool}`, param.range); dep.loc = expression.loc; parser.state.module.addPresentationalDependency(dep); } else { parser.walkExpression(expression.left); } if (!keepRight) { const dep = new ConstDependency( "0", expression.right.range ); dep.loc = expression.loc; parser.state.module.addPresentationalDependency(dep); } return keepRight; } } else if (expression.operator === "??") { const param = parser.evaluateExpression(expression.left); const keepRight = param && param.asNullish(); if (typeof keepRight === "boolean") { // ------------------------------------------ // // Given the following code: // // nonNullish ?? someExpression(); // // the generated code is: // // nonNullish ?? 0; // // ------------------------------------------ // // Given the following code: // // nullish ?? someExpression(); // // the generated code is: // // null ?? someExpression(); // if (!param.couldHaveSideEffects() && keepRight) { // cspell:word returnnull // for case like // // return('development'===process.env.NODE_ENV&&null)??'foo' // // we need a space before the bool to prevent result like // // returnnull??'foo' // const dep = new ConstDependency(" null", param.range); dep.loc = expression.loc; parser.state.module.addPresentationalDependency(dep); } else { const dep = new ConstDependency( "0", expression.right.range ); dep.loc = expression.loc; parser.state.module.addPresentationalDependency(dep); parser.walkExpression(expression.left); } return keepRight; } } } ); parser.hooks.optionalChaining.tap("ConstPlugin", expr => { /** @type {ExpressionNode[]} */ const optionalExpressionsStack = []; /** @type {ExpressionNode|SuperNode} */ let next = expr.expression; while ( next.type === "MemberExpression" || next.type === "CallExpression" ) { if (next.type === "MemberExpression") { if (next.optional) { // SuperNode can not be optional optionalExpressionsStack.push( /** @type {ExpressionNode} */ (next.object) ); } next = next.object; } else { if (next.optional) { // SuperNode can not be optional optionalExpressionsStack.push( /** @type {ExpressionNode} */ (next.callee) ); } next = next.callee; } } while (optionalExpressionsStack.length) { const expression = optionalExpressionsStack.pop(); const evaluated = parser.evaluateExpression(expression); if (evaluated && evaluated.asNullish()) { // ------------------------------------------ // // Given the following code: // // nullishMemberChain?.a.b(); // // the generated code is: // // undefined; // // ------------------------------------------ // const dep = new ConstDependency(" undefined", expr.range); dep.loc = expr.loc; parser.state.module.addPresentationalDependency(dep); return true; } } }); parser.hooks.evaluateIdentifier .for("__resourceQuery") .tap("ConstPlugin", expr => { if (parser.scope.isAsmJs) return; if (!parser.state.module) return; return evaluateToString( cachedParseResource(parser.state.module.resource).query )(expr); }); parser.hooks.expression .for("__resourceQuery") .tap("ConstPlugin", expr => { if (parser.scope.isAsmJs) return; if (!parser.state.module) return; const dep = new CachedConstDependency( JSON.stringify( cachedParseResource(parser.state.module.resource).query ), expr.range, "__resourceQuery" ); dep.loc = expr.loc; parser.state.module.addPresentationalDependency(dep); return true; }); parser.hooks.evaluateIdentifier .for("__resourceFragment") .tap("ConstPlugin", expr => { if (parser.scope.isAsmJs) return; if (!parser.state.module) return; return evaluateToString( cachedParseResource(parser.state.module.resource).fragment )(expr); }); parser.hooks.expression .for("__resourceFragment") .tap("ConstPlugin", expr => { if (parser.scope.isAsmJs) return; if (!parser.state.module) return; const dep = new CachedConstDependency( JSON.stringify( cachedParseResource(parser.state.module.resource).fragment ), expr.range, "__resourceFragment" ); dep.loc = expr.loc; parser.state.module.addPresentationalDependency(dep); return true; }); }; normalModuleFactory.hooks.parser .for("javascript/auto") .tap("ConstPlugin", handler); normalModuleFactory.hooks.parser .for("javascript/dynamic") .tap("ConstPlugin", handler); normalModuleFactory.hooks.parser .for("javascript/esm") .tap("ConstPlugin", handler); } ); } } module.exports = ConstPlugin;