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commonsChunkPlugin.ts
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commonsChunkPlugin.ts
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import {
addOrUpdateConfigObject,
createIdentifierOrLiteral,
createProperty,
findAndRemovePluginByName,
findPluginsByName,
findRootNodesByName
} from "@webpack-cli/utils/ast-utils";
import { JSCodeshift, Node } from "../types/NodePath";
// merge test entry prop and function expression. case 6[x]
// TODO: set the proper type once moved to @types/jscodeshift
// eslint-disable-next-line
const mergeTestPropArrowFunction = (j, chunkKey, testFunc): any => {
return j.property(
"init",
createIdentifierOrLiteral(j, "test"),
j.arrowFunctionExpression(
[j.identifier("module")],
j.blockStatement([
j.ifStatement(
j.callExpression(
j.memberExpression(
j.callExpression(j.memberExpression(j.identifier("module"), j.identifier("getChunks")), []),
j.identifier("some"),
false
),
[
j.arrowFunctionExpression(
[j.identifier("chunk")],
j.binaryExpression(
"===",
j.memberExpression(j.identifier("chunk"), j.identifier("name")),
j.literal(chunkKey)
)
)
]
),
j.returnStatement(j.literal(true))
),
j.variableDeclaration("const", [j.variableDeclarator(j.identifier("fn"), testFunc)]),
j.returnStatement(j.callExpression(j.identifier("fn"), [j.identifier("module")]))
])
)
);
};
/**
*
* Transform for CommonsChunkPlugin. If found, removes the
* plugin and sets optimizations.namedModules to true
*
* @param {Object} j - jscodeshift top-level import
* @param {Node} ast - jscodeshift ast to transform
* @returns {Node} ast - jscodeshift ast
*/
export default function(j: JSCodeshift, ast: Node): Node {
const splitChunksProps: Node[] = [];
const cacheGroupsProps: Node[] = [];
const optimizationProps: object = {};
let commonCacheGroupsProps: Node[] = [createProperty(j, "chunks", "initial"), createProperty(j, "enforce", true)];
// find old options
const CommonsChunkPlugin: Node = findPluginsByName(j, ast, ["webpack.optimize.CommonsChunkPlugin"]);
if (!CommonsChunkPlugin.size()) {
return ast;
}
// cache group options based on keys
let cacheGroup: object = {};
let cacheGroups: Node[] = [];
// iterate each CommonsChunkPlugin instance
CommonsChunkPlugin.forEach(
(path: Node): void => {
const CCPProps: Node[] = (path.value as Node).arguments[0].properties;
// reset chunks from old props
cacheGroup = {};
cacheGroups = [];
commonCacheGroupsProps = [createProperty(j, "chunks", "initial"), createProperty(j, "enforce", true)];
let chunkKey: string;
let chunkCount = 0;
// iterate CCP props and map SCP props
CCPProps.forEach(
(p: Node): void => {
const propKey: string = p.key.name;
switch (propKey) {
case "names":
(p.value as Node).elements.forEach(
({ value: chunkValue }): void => {
if (chunkValue === "runtime") {
optimizationProps["runtimeChunk"] = j.objectExpression([
createProperty(j, "name", chunkValue)
]);
} else {
if (!Array.isArray(cacheGroup[chunkValue as string])) {
cacheGroup[chunkValue as string] = [];
}
findRootNodesByName(j, ast, "entry").forEach(
({ value }): void => {
const { properties: entries } = (value as Node).value as Node;
chunkCount = entries.length;
entries.forEach(
({ key: { name: entryName } }): void => {
if (entryName === chunkValue) {
cacheGroup[chunkValue as string].push(
createProperty(j, "test", entryName)
);
}
}
);
}
);
}
}
);
break;
case "name": {
const nameKey = (p.value as Node).value as string;
if (nameKey === "runtime") {
optimizationProps["runtimeChunk"] = j.objectExpression([
createProperty(j, "name", nameKey)
]);
} else {
chunkKey = nameKey;
if (!Array.isArray(cacheGroup[nameKey])) {
cacheGroup[nameKey] = [];
}
findRootNodesByName(j, ast, "entry").forEach(
({ value }): void => {
const { properties: entries } = (value as Node).value as Node;
chunkCount = entries.length;
entries.forEach(
({ key: { name: entryName } }): void => {
if (entryName === nameKey) {
cacheGroup[nameKey].push(createProperty(j, "test", entryName));
}
}
);
}
);
}
break;
}
case "filename":
if (chunkKey) {
if (!Array.isArray(cacheGroup[chunkKey])) {
cacheGroup[chunkKey] = [];
}
cacheGroup[chunkKey].push(
createProperty(j, propKey, (p.value as Node).value as string)
);
}
break;
case "async":
if (!Array.isArray(cacheGroup[chunkKey])) {
cacheGroup[chunkKey] = [];
}
cacheGroup[chunkKey].push(createProperty(j, "chunks", "async"));
break;
case "minSize":
if (!Array.isArray(cacheGroup[chunkKey])) {
cacheGroup[chunkKey] = [];
}
cacheGroup[chunkKey].push(
j.property("init", createIdentifierOrLiteral(j, propKey), p.value as Node)
);
break;
case "minChunks": {
const { value: pathValue }: Node = p;
// minChunk is a function
if (
(pathValue as Node).type === "ArrowFunctionExpression" ||
(pathValue as Node).type === "FunctionExpression"
) {
if (!Array.isArray(cacheGroup[chunkKey])) {
cacheGroup[chunkKey] = [];
}
// eslint-disable-next-line
cacheGroup[chunkKey] = cacheGroup[chunkKey].map(
(prop): any =>
prop.key.name === "test"
? mergeTestPropArrowFunction(j, chunkKey, pathValue)
: prop
);
}
break;
}
}
}
);
Object.keys(cacheGroup).forEach(
(chunkName: string): void => {
let chunkProps: Node[] = [createProperty(j, "name", chunkName)];
const chunkPropsToAdd = cacheGroup[chunkName];
const chunkPropsKeys = chunkPropsToAdd.map((prop): string => prop.key.name);
commonCacheGroupsProps = commonCacheGroupsProps.filter(
(commonProp): boolean => !chunkPropsKeys.includes(commonProp.key.name)
);
chunkProps.push(...commonCacheGroupsProps);
if (chunkCount > 1) {
chunkProps.push(
j.property(
"init",
createIdentifierOrLiteral(j, "minChunks"),
createIdentifierOrLiteral(j, chunkCount)
)
);
}
const chunkPropsContainTest = chunkPropsToAdd.some(
(prop): boolean => prop.key.name === "test" && prop.value.type === "Literal"
);
if (chunkPropsContainTest) {
chunkProps = chunkProps.filter((prop): boolean => prop.key.name !== "minChunks");
}
if (chunkPropsToAdd && Array.isArray(chunkPropsToAdd) && chunkPropsToAdd.length > 0) {
chunkProps.push(...chunkPropsToAdd);
}
cacheGroups.push(
j.property("init", createIdentifierOrLiteral(j, chunkName), j.objectExpression([...chunkProps]))
);
}
);
if (cacheGroups.length > 0) {
cacheGroupsProps.push(...cacheGroups);
}
}
);
// Remove old plugin
const root: Node = findAndRemovePluginByName(j, ast, "webpack.optimize.CommonsChunkPlugin");
const rootProps: Node[] = [...splitChunksProps];
if (cacheGroupsProps.length > 0) {
rootProps.push(
j.property("init", createIdentifierOrLiteral(j, "cacheGroups"), j.objectExpression([...cacheGroupsProps]))
);
}
// Add new optimizations splitChunks option
if (root) {
addOrUpdateConfigObject(j, root, "optimizations", "splitChunks", j.objectExpression([...rootProps]));
Object.keys(optimizationProps).forEach(
(key: string): void => {
addOrUpdateConfigObject(j, root, "optimizations", key, optimizationProps[key]);
}
);
}
return ast;
}