const fs = require('fs');
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const _ = require('lodash');
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const acorn = require('acorn');
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const walk = require('acorn-walk');
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module.exports = {
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parseBundle
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};
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function parseBundle(bundlePath) {
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const content = fs.readFileSync(bundlePath, 'utf8');
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const ast = acorn.parse(content, {
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sourceType: 'script',
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// I believe in a bright future of ECMAScript!
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// Actually, it's set to `2050` to support the latest ECMAScript version that currently exists.
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// Seems like `acorn` supports such weird option value.
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ecmaVersion: 2050
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});
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const walkState = {
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locations: null
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};
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walk.recursive(
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ast,
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walkState,
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{
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AssignmentExpression(node, state) {
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if (state.locations) return;
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// Modules are stored in exports.modules:
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// exports.modules = {};
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const {left, right} = node;
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if (
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left &&
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left.object && left.object.name === 'exports' &&
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left.property && left.property.name === 'modules' &&
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isModulesHash(right)
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) {
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state.locations = getModulesLocations(right);
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}
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},
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CallExpression(node, state, c) {
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if (state.locations) return;
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const args = node.arguments;
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// Main chunk with webpack loader.
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// Modules are stored in first argument:
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// (function (...) {...})(<modules>)
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if (
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node.callee.type === 'FunctionExpression' &&
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!node.callee.id &&
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args.length === 1 &&
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isSimpleModulesList(args[0])
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) {
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state.locations = getModulesLocations(args[0]);
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return;
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}
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// Async Webpack < v4 chunk without webpack loader.
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// webpackJsonp([<chunks>], <modules>, ...)
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// As function name may be changed with `output.jsonpFunction` option we can't rely on it's default name.
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if (
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node.callee.type === 'Identifier' &&
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mayBeAsyncChunkArguments(args) &&
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isModulesList(args[1])
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) {
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state.locations = getModulesLocations(args[1]);
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return;
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}
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// Async Webpack v4 chunk without webpack loader.
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// (window.webpackJsonp=window.webpackJsonp||[]).push([[<chunks>], <modules>, ...]);
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// As function name may be changed with `output.jsonpFunction` option we can't rely on it's default name.
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if (isAsyncChunkPushExpression(node)) {
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state.locations = getModulesLocations(args[0].elements[1]);
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return;
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}
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// Webpack v4 WebWorkerChunkTemplatePlugin
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// globalObject.chunkCallbackName([<chunks>],<modules>, ...);
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// Both globalObject and chunkCallbackName can be changed through the config, so we can't check them.
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if (isAsyncWebWorkerChunkExpression(node)) {
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state.locations = getModulesLocations(args[1]);
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return;
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}
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|
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// Walking into arguments because some of plugins (e.g. `DedupePlugin`) or some Webpack
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// features (e.g. `umd` library output) can wrap modules list into additional IIFE.
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_.each(args, arg => c(arg, state));
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}
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}
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);
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let modules;
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if (walkState.locations) {
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modules = _.mapValues(walkState.locations,
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loc => content.slice(loc.start, loc.end)
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);
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} else {
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modules = {};
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}
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return {
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src: content,
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modules
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};
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}
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function isModulesList(node) {
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return (
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isSimpleModulesList(node) ||
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// Modules are contained in expression `Array([minimum ID]).concat([<module>, <module>, ...])`
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isOptimizedModulesArray(node)
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);
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}
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function isSimpleModulesList(node) {
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return (
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// Modules are contained in hash. Keys are module ids.
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isModulesHash(node) ||
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// Modules are contained in array. Indexes are module ids.
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isModulesArray(node)
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);
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}
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function isModulesHash(node) {
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return (
|
node.type === 'ObjectExpression' &&
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_(node.properties)
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.map('value')
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.every(isModuleWrapper)
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);
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}
|
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function isModulesArray(node) {
|
return (
|
node.type === 'ArrayExpression' &&
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_.every(node.elements, elem =>
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// Some of array items may be skipped because there is no module with such id
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!elem ||
|
isModuleWrapper(elem)
|
)
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);
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}
|
|
function isOptimizedModulesArray(node) {
|
// Checking whether modules are contained in `Array(<minimum ID>).concat(...modules)` array:
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// https://github.com/webpack/webpack/blob/v1.14.0/lib/Template.js#L91
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// The `<minimum ID>` + array indexes are module ids
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return (
|
node.type === 'CallExpression' &&
|
node.callee.type === 'MemberExpression' &&
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// Make sure the object called is `Array(<some number>)`
|
node.callee.object.type === 'CallExpression' &&
|
node.callee.object.callee.type === 'Identifier' &&
|
node.callee.object.callee.name === 'Array' &&
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node.callee.object.arguments.length === 1 &&
|
isNumericId(node.callee.object.arguments[0]) &&
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// Make sure the property X called for `Array(<some number>).X` is `concat`
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node.callee.property.type === 'Identifier' &&
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node.callee.property.name === 'concat' &&
|
// Make sure exactly one array is passed in to `concat`
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node.arguments.length === 1 &&
|
isModulesArray(node.arguments[0])
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);
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}
|
|
function isModuleWrapper(node) {
|
return (
|
// It's an anonymous function expression that wraps module
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((node.type === 'FunctionExpression' || node.type === 'ArrowFunctionExpression') && !node.id) ||
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// If `DedupePlugin` is used it can be an ID of duplicated module...
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isModuleId(node) ||
|
// or an array of shape [<module_id>, ...args]
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(node.type === 'ArrayExpression' && node.elements.length > 1 && isModuleId(node.elements[0]))
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);
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}
|
|
function isModuleId(node) {
|
return (node.type === 'Literal' && (isNumericId(node) || typeof node.value === 'string'));
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}
|
|
function isNumericId(node) {
|
return (node.type === 'Literal' && Number.isInteger(node.value) && node.value >= 0);
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}
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|
function isChunkIds(node) {
|
// Array of numeric or string ids. Chunk IDs are strings when NamedChunksPlugin is used
|
return (
|
node.type === 'ArrayExpression' &&
|
_.every(node.elements, isModuleId)
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);
|
}
|
|
function isAsyncChunkPushExpression(node) {
|
const {
|
callee,
|
arguments: args
|
} = node;
|
|
return (
|
callee.type === 'MemberExpression' &&
|
callee.property.name === 'push' &&
|
callee.object.type === 'AssignmentExpression' &&
|
args.length === 1 &&
|
args[0].type === 'ArrayExpression' &&
|
mayBeAsyncChunkArguments(args[0].elements) &&
|
isModulesList(args[0].elements[1])
|
);
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}
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|
function mayBeAsyncChunkArguments(args) {
|
return (
|
args.length >= 2 &&
|
isChunkIds(args[0])
|
);
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}
|
|
function isAsyncWebWorkerChunkExpression(node) {
|
const {callee, type, arguments: args} = node;
|
|
return (
|
type === 'CallExpression' &&
|
callee.type === 'MemberExpression' &&
|
args.length === 2 &&
|
isChunkIds(args[0]) &&
|
isModulesList(args[1])
|
);
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}
|
|
function getModulesLocations(node) {
|
if (node.type === 'ObjectExpression') {
|
// Modules hash
|
const modulesNodes = node.properties;
|
|
return _.transform(modulesNodes, (result, moduleNode) => {
|
const moduleId = moduleNode.key.name || moduleNode.key.value;
|
|
result[moduleId] = getModuleLocation(moduleNode.value);
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}, {});
|
}
|
|
const isOptimizedArray = (node.type === 'CallExpression');
|
|
if (node.type === 'ArrayExpression' || isOptimizedArray) {
|
// Modules array or optimized array
|
const minId = isOptimizedArray ?
|
// Get the [minId] value from the Array() call first argument literal value
|
node.callee.object.arguments[0].value :
|
// `0` for simple array
|
0;
|
const modulesNodes = isOptimizedArray ?
|
// The modules reside in the `concat()` function call arguments
|
node.arguments[0].elements :
|
node.elements;
|
|
return _.transform(modulesNodes, (result, moduleNode, i) => {
|
if (!moduleNode) return;
|
result[i + minId] = getModuleLocation(moduleNode);
|
}, {});
|
}
|
|
return {};
|
}
|
|
function getModuleLocation(node) {
|
return {
|
start: node.start,
|
end: node.end
|
};
|
}
|
