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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
"use strict";
const {
JAVASCRIPT_MODULE_TYPE_AUTO,
JAVASCRIPT_MODULE_TYPE_ESM
} = require("../ModuleTypeConstants");
const PureExpressionDependency = require("../dependencies/PureExpressionDependency");
const InnerGraph = require("./InnerGraph");
/** @typedef {import("estree").ClassDeclaration} ClassDeclaration */
/** @typedef {import("estree").ClassExpression} ClassExpression */
/** @typedef {import("estree").Expression} Expression */
/** @typedef {import("estree").MaybeNamedClassDeclaration} MaybeNamedClassDeclaration */
/** @typedef {import("estree").MaybeNamedFunctionDeclaration} MaybeNamedFunctionDeclaration */
/** @typedef {import("estree").Node} Node */
/** @typedef {import("estree").VariableDeclarator} VariableDeclarator */
/** @typedef {import("../../declarations/WebpackOptions").JavascriptParserOptions} JavascriptParserOptions */
/** @typedef {import("../Compiler")} Compiler */
/** @typedef {import("../Dependency")} Dependency */
/** @typedef {import("../Dependency").DependencyLocation} DependencyLocation */
/** @typedef {import("../dependencies/HarmonyImportSpecifierDependency")} HarmonyImportSpecifierDependency */
/** @typedef {import("../javascript/JavascriptParser")} JavascriptParser */
/** @typedef {import("../javascript/JavascriptParser").Range} Range */
/** @typedef {import("./InnerGraph").InnerGraph} InnerGraph */
/** @typedef {import("./InnerGraph").TopLevelSymbol} TopLevelSymbol */
const { topLevelSymbolTag } = InnerGraph;
const PLUGIN_NAME = "InnerGraphPlugin";
class InnerGraphPlugin {
/**
* Apply the plugin
* @param {Compiler} compiler the compiler instance
* @returns {void}
*/
apply(compiler) {
compiler.hooks.compilation.tap(
PLUGIN_NAME,
(compilation, { normalModuleFactory }) => {
const logger = compilation.getLogger("webpack.InnerGraphPlugin");
compilation.dependencyTemplates.set(
PureExpressionDependency,
new PureExpressionDependency.Template()
);
/**
* @param {JavascriptParser} parser the parser
* @param {JavascriptParserOptions} parserOptions options
* @returns {void}
*/
const handler = (parser, parserOptions) => {
/**
* @param {Expression} sup sup
*/
const onUsageSuper = sup => {
InnerGraph.onUsage(parser.state, usedByExports => {
switch (usedByExports) {
case undefined:
case true:
return;
default: {
const dep = new PureExpressionDependency(
/** @type {Range} */
(sup.range)
);
dep.loc = /** @type {DependencyLocation} */ (sup.loc);
dep.usedByExports = usedByExports;
parser.state.module.addDependency(dep);
break;
}
}
});
};
parser.hooks.program.tap(PLUGIN_NAME, () => {
InnerGraph.enable(parser.state);
});
parser.hooks.finish.tap(PLUGIN_NAME, () => {
if (!InnerGraph.isEnabled(parser.state)) return;
logger.time("infer dependency usage");
InnerGraph.inferDependencyUsage(parser.state);
logger.timeAggregate("infer dependency usage");
});
// During prewalking the following datastructures are filled with
// nodes that have a TopLevelSymbol assigned and
// variables are tagged with the assigned TopLevelSymbol
// We differ 3 types of nodes:
// 1. full statements (export default, function declaration)
// 2. classes (class declaration, class expression)
// 3. variable declarators (const x = ...)
/** @type {WeakMap<Node | MaybeNamedFunctionDeclaration | MaybeNamedClassDeclaration, TopLevelSymbol>} */
const statementWithTopLevelSymbol = new WeakMap();
/** @type {WeakMap<Node | MaybeNamedFunctionDeclaration | MaybeNamedClassDeclaration, Node>} */
const statementPurePart = new WeakMap();
/** @type {WeakMap<ClassExpression | ClassDeclaration | MaybeNamedClassDeclaration, TopLevelSymbol>} */
const classWithTopLevelSymbol = new WeakMap();
/** @type {WeakMap<VariableDeclarator, TopLevelSymbol>} */
const declWithTopLevelSymbol = new WeakMap();
/** @type {WeakSet<VariableDeclarator>} */
const pureDeclarators = new WeakSet();
// The following hooks are used during prewalking:
parser.hooks.preStatement.tap(PLUGIN_NAME, statement => {
if (!InnerGraph.isEnabled(parser.state)) return;
if (
parser.scope.topLevelScope === true &&
statement.type === "FunctionDeclaration"
) {
const name = statement.id ? statement.id.name : "*default*";
const fn =
/** @type {TopLevelSymbol} */
(InnerGraph.tagTopLevelSymbol(parser, name));
statementWithTopLevelSymbol.set(statement, fn);
return true;
}
});
parser.hooks.blockPreStatement.tap(PLUGIN_NAME, statement => {
if (!InnerGraph.isEnabled(parser.state)) return;
if (parser.scope.topLevelScope === true) {
if (
statement.type === "ClassDeclaration" &&
parser.isPure(
statement,
/** @type {Range} */ (statement.range)[0]
)
) {
const name = statement.id ? statement.id.name : "*default*";
const fn = /** @type {TopLevelSymbol} */ (
InnerGraph.tagTopLevelSymbol(parser, name)
);
classWithTopLevelSymbol.set(statement, fn);
return true;
}
if (statement.type === "ExportDefaultDeclaration") {
const name = "*default*";
const fn =
/** @type {TopLevelSymbol} */
(InnerGraph.tagTopLevelSymbol(parser, name));
const decl = statement.declaration;
if (
(decl.type === "ClassExpression" ||
decl.type === "ClassDeclaration") &&
parser.isPure(
/** @type {ClassExpression | ClassDeclaration} */
(decl),
/** @type {Range} */
(decl.range)[0]
)
) {
classWithTopLevelSymbol.set(
/** @type {ClassExpression | ClassDeclaration} */
(decl),
fn
);
} else if (
parser.isPure(
/** @type {Expression} */
(decl),
/** @type {Range} */
(statement.range)[0]
)
) {
statementWithTopLevelSymbol.set(statement, fn);
if (
!decl.type.endsWith("FunctionExpression") &&
!decl.type.endsWith("Declaration") &&
decl.type !== "Literal"
) {
statementPurePart.set(
statement,
/** @type {Expression} */
(decl)
);
}
}
}
}
});
parser.hooks.preDeclarator.tap(PLUGIN_NAME, (decl, _statement) => {
if (!InnerGraph.isEnabled(parser.state)) return;
if (
parser.scope.topLevelScope === true &&
decl.init &&
decl.id.type === "Identifier"
) {
const name = decl.id.name;
if (
decl.init.type === "ClassExpression" &&
parser.isPure(
decl.init,
/** @type {Range} */ (decl.id.range)[1]
)
) {
const fn =
/** @type {TopLevelSymbol} */
(InnerGraph.tagTopLevelSymbol(parser, name));
classWithTopLevelSymbol.set(decl.init, fn);
} else if (
parser.isPure(
decl.init,
/** @type {Range} */ (decl.id.range)[1]
)
) {
const fn =
/** @type {TopLevelSymbol} */
(InnerGraph.tagTopLevelSymbol(parser, name));
declWithTopLevelSymbol.set(decl, fn);
if (
!decl.init.type.endsWith("FunctionExpression") &&
decl.init.type !== "Literal"
) {
pureDeclarators.add(decl);
}
}
}
});
// During real walking we set the TopLevelSymbol state to the assigned
// TopLevelSymbol by using the fill datastructures.
// In addition to tracking TopLevelSymbols, we sometimes need to
// add a PureExpressionDependency. This is needed to skip execution
// of pure expressions, even when they are not dropped due to
// minimizing. Otherwise symbols used there might not exist anymore
// as they are removed as unused by this optimization
// When we find a reference to a TopLevelSymbol, we register a
// TopLevelSymbol dependency from TopLevelSymbol in state to the
// referenced TopLevelSymbol. This way we get a graph of all
// TopLevelSymbols.
// The following hooks are called during walking:
parser.hooks.statement.tap(PLUGIN_NAME, statement => {
if (!InnerGraph.isEnabled(parser.state)) return;
if (parser.scope.topLevelScope === true) {
InnerGraph.setTopLevelSymbol(parser.state, undefined);
const fn = statementWithTopLevelSymbol.get(statement);
if (fn) {
InnerGraph.setTopLevelSymbol(parser.state, fn);
const purePart = statementPurePart.get(statement);
if (purePart) {
InnerGraph.onUsage(parser.state, usedByExports => {
switch (usedByExports) {
case undefined:
case true:
return;
default: {
const dep = new PureExpressionDependency(
/** @type {Range} */ (purePart.range)
);
dep.loc =
/** @type {DependencyLocation} */
(statement.loc);
dep.usedByExports = usedByExports;
parser.state.module.addDependency(dep);
break;
}
}
});
}
}
}
});
parser.hooks.classExtendsExpression.tap(
PLUGIN_NAME,
(expr, statement) => {
if (!InnerGraph.isEnabled(parser.state)) return;
if (parser.scope.topLevelScope === true) {
const fn = classWithTopLevelSymbol.get(statement);
if (
fn &&
parser.isPure(
expr,
statement.id
? /** @type {Range} */ (statement.id.range)[1]
: /** @type {Range} */ (statement.range)[0]
)
) {
InnerGraph.setTopLevelSymbol(parser.state, fn);
onUsageSuper(expr);
}
}
}
);
parser.hooks.classBodyElement.tap(
PLUGIN_NAME,
(element, classDefinition) => {
if (!InnerGraph.isEnabled(parser.state)) return;
if (parser.scope.topLevelScope === true) {
const fn = classWithTopLevelSymbol.get(classDefinition);
if (fn) {
InnerGraph.setTopLevelSymbol(parser.state, undefined);
}
}
}
);
parser.hooks.classBodyValue.tap(
PLUGIN_NAME,
(expression, element, classDefinition) => {
if (!InnerGraph.isEnabled(parser.state)) return;
if (parser.scope.topLevelScope === true) {
const fn = classWithTopLevelSymbol.get(classDefinition);
if (fn) {
if (
!element.static ||
parser.isPure(
expression,
element.key
? /** @type {Range} */ (element.key.range)[1]
: /** @type {Range} */ (element.range)[0]
)
) {
InnerGraph.setTopLevelSymbol(parser.state, fn);
if (element.type !== "MethodDefinition" && element.static) {
InnerGraph.onUsage(parser.state, usedByExports => {
switch (usedByExports) {
case undefined:
case true:
return;
default: {
const dep = new PureExpressionDependency(
/** @type {Range} */ (expression.range)
);
dep.loc =
/** @type {DependencyLocation} */
(expression.loc);
dep.usedByExports = usedByExports;
parser.state.module.addDependency(dep);
break;
}
}
});
}
} else {
InnerGraph.setTopLevelSymbol(parser.state, undefined);
}
}
}
}
);
parser.hooks.declarator.tap(PLUGIN_NAME, (decl, _statement) => {
if (!InnerGraph.isEnabled(parser.state)) return;
const fn = declWithTopLevelSymbol.get(decl);
if (fn) {
InnerGraph.setTopLevelSymbol(parser.state, fn);
if (pureDeclarators.has(decl)) {
if (
/** @type {ClassExpression} */
(decl.init).type === "ClassExpression"
) {
if (decl.init.superClass) {
onUsageSuper(decl.init.superClass);
}
} else {
InnerGraph.onUsage(parser.state, usedByExports => {
switch (usedByExports) {
case undefined:
case true:
return;
default: {
const dep = new PureExpressionDependency(
/** @type {Range} */ (
/** @type {ClassExpression} */
(decl.init).range
)
);
dep.loc = /** @type {DependencyLocation} */ (decl.loc);
dep.usedByExports = usedByExports;
parser.state.module.addDependency(dep);
break;
}
}
});
}
}
parser.walkExpression(
/** @type {NonNullable<VariableDeclarator["init"]>} */ (
decl.init
)
);
InnerGraph.setTopLevelSymbol(parser.state, undefined);
return true;
} else if (
decl.id.type === "Identifier" &&
decl.init &&
decl.init.type === "ClassExpression" &&
classWithTopLevelSymbol.has(decl.init)
) {
parser.walkExpression(decl.init);
InnerGraph.setTopLevelSymbol(parser.state, undefined);
return true;
}
});
parser.hooks.expression
.for(topLevelSymbolTag)
.tap(PLUGIN_NAME, () => {
const topLevelSymbol = /** @type {TopLevelSymbol} */ (
parser.currentTagData
);
const currentTopLevelSymbol = InnerGraph.getTopLevelSymbol(
parser.state
);
InnerGraph.addUsage(
parser.state,
topLevelSymbol,
currentTopLevelSymbol || true
);
});
parser.hooks.assign.for(topLevelSymbolTag).tap(PLUGIN_NAME, expr => {
if (!InnerGraph.isEnabled(parser.state)) return;
if (expr.operator === "=") return true;
});
};
normalModuleFactory.hooks.parser
.for(JAVASCRIPT_MODULE_TYPE_AUTO)
.tap(PLUGIN_NAME, handler);
normalModuleFactory.hooks.parser
.for(JAVASCRIPT_MODULE_TYPE_ESM)
.tap(PLUGIN_NAME, handler);
compilation.hooks.finishModules.tap(PLUGIN_NAME, () => {
logger.timeAggregateEnd("infer dependency usage");
});
}
);
}
}
module.exports = InnerGraphPlugin;