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enable prefer const (#5113)

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This commit is contained in:
Henry Zhu
2017-01-14 09:48:52 -05:00
committed by GitHub
parent 982850731e
commit 672adba9a1
177 changed files with 1862 additions and 1863 deletions
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128
packages/babel-plugin-transform-es2015-modules-commonjs/src/index.js
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@@ -4,17 +4,17 @@ import { basename, extname } from "path";
import template from "babel-template";
import * as t from "babel-types";
let buildRequire = template(`
const buildRequire = template(`
require($0);
`);
let buildExportsModuleDeclaration = template(`
const buildExportsModuleDeclaration = template(`
Object.defineProperty(exports, "__esModule", {
value: true
});
`);
let buildExportsFrom = template(`
const buildExportsFrom = template(`
Object.defineProperty(exports, $0, {
enumerable: true,
get: function () {
@@ -23,15 +23,15 @@ let buildExportsFrom = template(`
});
`);
let buildLooseExportsModuleDeclaration = template(`
const buildLooseExportsModuleDeclaration = template(`
exports.__esModule = true;
`);
let buildExportsAssignment = template(`
const buildExportsAssignment = template(`
exports.$0 = $1;
`);
let buildExportAll = template(`
const buildExportAll = template(`
Object.keys(OBJECT).forEach(function (key) {
if (key === "default" || key === "__esModule") return;
Object.defineProperty(exports, key, {
@@ -46,12 +46,12 @@ let buildExportAll = template(`
const THIS_BREAK_KEYS = ["FunctionExpression", "FunctionDeclaration", "ClassProperty", "ClassMethod", "ObjectMethod"];
export default function () {
let REASSIGN_REMAP_SKIP = Symbol();
const REASSIGN_REMAP_SKIP = Symbol();
let reassignmentVisitor = {
const reassignmentVisitor = {
ReferencedIdentifier(path) {
let name = path.node.name;
let remap = this.remaps[name];
const name = path.node.name;
const remap = this.remaps[name];
if (!remap) return;
// redeclared in this scope
@@ -72,11 +72,11 @@ export default function () {
let node = path.node;
if (node[REASSIGN_REMAP_SKIP]) return;
let left = path.get("left");
const left = path.get("left");
if (!left.isIdentifier()) return;
let name = left.node.name;
let exports = this.exports[name];
const name = left.node.name;
const exports = this.exports[name];
if (!exports) return;
// redeclared in this scope
@@ -84,7 +84,7 @@ export default function () {
node[REASSIGN_REMAP_SKIP] = true;
for (let reid of exports) {
for (const reid of exports) {
node = buildExportsAssignment(reid, node).expression;
}
@@ -93,17 +93,17 @@ export default function () {
},
UpdateExpression(path) {
let arg = path.get("argument");
const arg = path.get("argument");
if (!arg.isIdentifier()) return;
let name = arg.node.name;
let exports = this.exports[name];
const name = arg.node.name;
const exports = this.exports[name];
if (!exports) return;
// redeclared in this scope
if (this.scope.getBinding(name) !== path.scope.getBinding(name)) return;
let node = t.assignmentExpression(path.node.operator[0] + "=", arg.node, t.numericLiteral(1));
const node = t.assignmentExpression(path.node.operator[0] + "=", arg.node, t.numericLiteral(1));
if ((path.parentPath.isExpressionStatement() && !path.isCompletionRecord()) || path.node.prefix) {
path.replaceWith(node);
@@ -111,7 +111,7 @@ export default function () {
return;
}
let nodes = [];
const nodes = [];
nodes.push(node);
let operator;
@@ -149,9 +149,9 @@ export default function () {
exit(path) {
this.ranCommonJS = true;
let strict = !!this.opts.strict;
const strict = !!this.opts.strict;
let { scope } = path;
const { scope } = path;
// rename these commonjs variables if they're declared in the file
scope.rename("module");
@@ -161,24 +161,24 @@ export default function () {
let hasExports = false;
let hasImports = false;
let body: Array<Object> = path.get("body");
let imports = Object.create(null);
let exports = Object.create(null);
const body: Array<Object> = path.get("body");
const imports = Object.create(null);
const exports = Object.create(null);
let nonHoistedExportNames = Object.create(null);
const nonHoistedExportNames = Object.create(null);
let topNodes = [];
let remaps = Object.create(null);
const topNodes = [];
const remaps = Object.create(null);
let requires = Object.create(null);
const requires = Object.create(null);
function addRequire(source, blockHoist) {
let cached = requires[source];
const cached = requires[source];
if (cached) return cached;
let ref = path.scope.generateUidIdentifier(basename(source, extname(source)));
const ref = path.scope.generateUidIdentifier(basename(source, extname(source)));
let varDecl = t.variableDeclaration("var", [
const varDecl = t.variableDeclaration("var", [
t.variableDeclarator(ref, buildRequire(
t.stringLiteral(source)
).expression)
@@ -200,17 +200,17 @@ export default function () {
}
function addTo(obj, key, arr) {
let existing = obj[key] || [];
const existing = obj[key] || [];
obj[key] = existing.concat(arr);
}
for (let path of body) {
for (const path of body) {
if (path.isExportDeclaration()) {
hasExports = true;
let specifiers = [].concat(path.get("declaration"), path.get("specifiers"));
for (let specifier of specifiers) {
let ids = specifier.getBindingIdentifiers();
const specifiers = [].concat(path.get("declaration"), path.get("specifiers"));
for (const specifier of specifiers) {
const ids = specifier.getBindingIdentifiers();
if (ids.__esModule) {
throw specifier.buildCodeFrameError("Illegal export \"__esModule\"");
}
@@ -220,8 +220,8 @@ export default function () {
if (path.isImportDeclaration()) {
hasImports = true;
let key = path.node.source.value;
let importsEntry = imports[key] || {
const key = path.node.source.value;
const importsEntry = imports[key] || {
specifiers: [],
maxBlockHoist: 0,
loc: path.node.loc,
@@ -240,10 +240,10 @@ export default function () {
path.remove();
} else if (path.isExportDefaultDeclaration()) {
let declaration = path.get("declaration");
const declaration = path.get("declaration");
if (declaration.isFunctionDeclaration()) {
let id = declaration.node.id;
let defNode = t.identifier("default");
const id = declaration.node.id;
const defNode = t.identifier("default");
if (id) {
addTo(exports, id.name, defNode);
topNodes.push(buildExportsAssignment(defNode, id));
@@ -253,8 +253,8 @@ export default function () {
path.remove();
}
} else if (declaration.isClassDeclaration()) {
let id = declaration.node.id;
let defNode = t.identifier("default");
const id = declaration.node.id;
const defNode = t.identifier("default");
if (id) {
addTo(exports, id.name, defNode);
path.replaceWithMultiple([
@@ -278,15 +278,15 @@ export default function () {
path.parentPath.requeue(path.get("expression.left"));
}
} else if (path.isExportNamedDeclaration()) {
let declaration = path.get("declaration");
const declaration = path.get("declaration");
if (declaration.node) {
if (declaration.isFunctionDeclaration()) {
let id = declaration.node.id;
const id = declaration.node.id;
addTo(exports, id.name, id);
topNodes.push(buildExportsAssignment(id, id));
path.replaceWith(declaration.node);
} else if (declaration.isClassDeclaration()) {
let id = declaration.node.id;
const id = declaration.node.id;
addTo(exports, id.name, id);
path.replaceWithMultiple([
declaration.node,
@@ -294,11 +294,11 @@ export default function () {
]);
nonHoistedExportNames[id.name] = true;
} else if (declaration.isVariableDeclaration()) {
let declarators = declaration.get("declarations");
for (let decl of declarators) {
let id = decl.get("id");
const declarators = declaration.get("declarations");
for (const decl of declarators) {
const id = decl.get("id");
let init = decl.get("init");
const init = decl.get("init");
if (!init.node) init.replaceWith(t.identifier("undefined"));
if (id.isIdentifier()) {
@@ -314,13 +314,13 @@ export default function () {
continue;
}
let specifiers = path.get("specifiers");
let nodes = [];
let source = path.node.source;
const specifiers = path.get("specifiers");
const nodes = [];
const source = path.node.source;
if (source) {
let ref = addRequire(source.value, path.node._blockHoist);
const ref = addRequire(source.value, path.node._blockHoist);
for (let specifier of specifiers) {
for (const specifier of specifiers) {
if (specifier.isExportNamespaceSpecifier()) {
// todo
} else if (specifier.isExportDefaultSpecifier()) {
@@ -335,7 +335,7 @@ export default function () {
}
}
} else {
for (let specifier of specifiers) {
for (const specifier of specifiers) {
if (specifier.isExportSpecifier()) {
addTo(exports, specifier.node.local.name, specifier.node.exported);
nonHoistedExportNames[specifier.node.exported.name] = true;
@@ -345,7 +345,7 @@ export default function () {
}
path.replaceWithMultiple(nodes);
} else if (path.isExportAllDeclaration()) {
let exportNode = buildExportAll({
const exportNode = buildExportAll({
OBJECT: addRequire(path.node.source.value, path.node._blockHoist)
});
exportNode.loc = path.node.loc;
@@ -354,15 +354,15 @@ export default function () {
}
}
for (let source in imports) {
let {specifiers, maxBlockHoist} = imports[source];
for (const source in imports) {
const {specifiers, maxBlockHoist} = imports[source];
if (specifiers.length) {
let uid = addRequire(source, maxBlockHoist);
const uid = addRequire(source, maxBlockHoist);
let wildcard;
for (let i = 0; i < specifiers.length; i++) {
let specifier = specifiers[i];
const specifier = specifiers[i];
if (t.isImportNamespaceSpecifier(specifier)) {
if (strict) {
remaps[specifier.local.name] = uid;
@@ -389,7 +389,7 @@ export default function () {
}
}
for (let specifier of specifiers) {
for (const specifier of specifiers) {
if (t.isImportSpecifier(specifier)) {
let target = uid;
if (specifier.imported.name === "default") {
@@ -419,7 +419,7 @@ export default function () {
}
} else {
// bare import
let requireNode = buildRequire(t.stringLiteral(source));
const requireNode = buildRequire(t.stringLiteral(source));
requireNode.loc = imports[source].loc;
topNodes.push(requireNode);
}
@@ -428,7 +428,7 @@ export default function () {
if (hasImports && Object.keys(nonHoistedExportNames).length) {
let hoistedExportsNode = t.identifier("undefined");
for (let name in nonHoistedExportNames) {
for (const name in nonHoistedExportNames) {
hoistedExportsNode = buildExportsAssignment(t.identifier(name), hoistedExportsNode).expression;
}