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Copy pathnative-class.js
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326 lines (269 loc) · 9.53 KB
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const ts = require('typescript');
function before(_options, program) {
const compilerOptions = program?.getCompilerOptions?.() ?? {};
return (context) => {
const factory = context.factory ?? ts.factory;
return (sourceFile) => {
let mutated = false;
// Always preserve original top-level import declarations in final output
const originalImportStatements = sourceFile.statements.filter((s) => ts.isImportDeclaration(s));
const transformStatements = (statements, isTopLevel) => {
let changed = false;
const result = [];
for (const statement of statements) {
if (ts.isClassDeclaration(statement) && hasNativeClassDecorator(statement)) {
mutated = true;
changed = true;
result.push(...emitDownleveledClass(statement));
continue;
}
if (ts.isExpressionStatement(statement)) {
const updated = removeNativeClassFromDecorate(factory, statement);
if (updated === undefined) {
mutated = true;
changed = true;
continue;
}
const visited = ts.visitEachChild(updated, visitNode, context);
if (updated !== statement || visited !== statement) {
mutated = true;
changed = true;
}
result.push(visited);
continue;
}
if (isTopLevel && ts.isImportDeclaration(statement)) {
// Safety: Do not alter import declarations here. Earlier versions attempted to
// remove `NativeClass` from named imports, but this proved too risky and could
// accidentally elide unrelated imports in certain TS versions/configs. We keep
// imports intact and rely on bundlers/TS to tree-shake if needed.
result.push(statement);
continue;
}
const visited = ts.visitEachChild(statement, visitNode, context);
if (visited !== statement) {
mutated = true;
changed = true;
}
result.push(visited);
}
return [changed ? factory.createNodeArray(result) : statements, changed];
};
function visitNode(node) {
if (ts.isBlock(node)) {
const [blockStatements, changed] = transformStatements(node.statements, false);
if (!changed) {
return node;
}
return factory.updateBlock(node, blockStatements);
}
if (ts.isModuleBlock(node)) {
const [moduleStatements, changed] = transformStatements(node.statements, false);
if (!changed) {
return node;
}
return factory.updateModuleBlock(node, moduleStatements);
}
if (ts.isCaseClause(node)) {
const expression = ts.visitNode(node.expression, visitNode);
const [clauseStatements, changed] = transformStatements(node.statements, false);
if (expression !== node.expression) {
mutated = true;
}
if (!changed && expression === node.expression) {
return node;
}
return factory.updateCaseClause(node, expression ?? node.expression, clauseStatements);
}
if (ts.isDefaultClause(node)) {
const [clauseStatements, changed] = transformStatements(node.statements, false);
if (!changed) {
return node;
}
mutated = true;
return factory.updateDefaultClause(node, clauseStatements);
}
return ts.visitEachChild(node, visitNode, context);
}
const [updatedStatements] = transformStatements(sourceFile.statements, true);
if (!mutated) {
return sourceFile;
}
// Ensure imports are retained at the top in the updated source
const nonImportStatements = updatedStatements.filter((s) => !ts.isImportDeclaration(s));
const finalStatements = factory.createNodeArray([...originalImportStatements, ...nonImportStatements]);
const updatedSource = factory.updateSourceFile(sourceFile, finalStatements);
// Do NOT clear or rebind the entire SourceFile here. Doing so can break TS's
// import usage analysis and lead to import elision. The factory/update API
// preserves parents/bindings for original nodes (like imports). We only
// synthesize/bind the newly inserted class replacement statements.
return updatedSource;
};
};
}
function hasNativeClassDecorator(node) {
const decorators = ts.getDecorators?.(node) ?? node.decorators;
return !!decorators && decorators.some((decorator) => getIdentifierText(decorator) === 'NativeClass');
}
function emitDownleveledClass(node) {
// Preserve leading trivia (including possible preceding import statements separated earlier by bundler) only remove the decorator itself.
const stripped = node.getText().replace(/@NativeClass(?:\((?:.|\n)*?\))?\s*/gm, '');
const downleveled = ts
.transpileModule(stripped, {
compilerOptions: {
module: ts.ModuleKind.ESNext,
target: ts.ScriptTarget.ES5,
noEmitHelpers: true,
experimentalDecorators: true,
emitDecoratorMetadata: false,
useDefineForClassFields: false,
},
})
.outputText.replace(/(Object\.defineProperty\(.*?{.*?)(enumerable:\s*false)(.*?}\))/gs, '$1enumerable: true$3');
const helperSource = ts.createSourceFile(
(node.getSourceFile()?.fileName ?? 'NativeClass.ts') + '.helper.js',
downleveled,
ts.ScriptTarget.ES5,
true,
ts.ScriptKind.JS,
);
const statements = [];
for (const statement of helperSource.statements) {
if (statement.kind === ts.SyntaxKind.EndOfFileToken) {
continue;
}
// Explicitly skip import declarations accidentally re-emitted (shouldn't occur but defensive)
if (ts.isImportDeclaration(statement)) {
continue;
}
const prepared = prepareSynthesizedNode(statement, node);
statements.push(prepared);
}
return statements;
}
function prepareSynthesizedNode(node, original) {
const clone = ts.factory.cloneNode(node);
markSynthesizedRecursive(clone);
setSynthesizedRangeRecursive(clone);
clearBindingRecursive(clone);
setOriginalRecursive(clone, original);
return clone;
}
function markSynthesizedRecursive(node) {
if (!node || typeof node.kind !== 'number') {
return;
}
if (typeof node.flags === 'number') {
node.flags |= ts.NodeFlags.Synthesized;
}
ts.forEachChild(node, (child) => markSynthesizedRecursive(child));
}
function removeBindingData(node) {
delete node.symbol;
delete node.localSymbol;
delete node.emitNode;
delete node.flowNode;
delete node.locals;
delete node.nextContainer;
}
function clearBindingRecursive(node) {
if (!node || typeof node.kind !== 'number') {
return;
}
removeBindingData(node);
ts.forEachChild(node, (child) => clearBindingRecursive(child));
}
function setSynthesizedRangeRecursive(node) {
if (!node || typeof node.kind !== 'number') {
return;
}
if (typeof node.pos === 'number') {
node.pos = -1;
}
if (typeof node.end === 'number') {
node.end = -1;
}
ts.forEachChild(node, (child) => setSynthesizedRangeRecursive(child));
}
function setParentRecursive(node, parent) {
if (!node || typeof node.kind !== 'number') {
return;
}
node.parent = parent;
ts.forEachChild(node, (child) => setParentRecursive(child, node));
}
function setOriginalRecursive(node, original) {
ts.setOriginalNode(node, original);
ts.forEachChild(node, (child) => setOriginalRecursive(child, original));
}
function removeNativeClassFromDecorate(factory, statement) {
const expr = statement.expression;
if (!ts.isBinaryExpression(expr) || expr.operatorToken.kind !== ts.SyntaxKind.EqualsToken) {
return statement;
}
const right = expr.right;
if (!ts.isCallExpression(right) || getIdentifierText(right.expression) !== '__decorate' || right.arguments.length === 0) {
return statement;
}
const arrayLiteral = right.arguments[0];
if (!ts.isArrayLiteralExpression(arrayLiteral)) {
return statement;
}
const retained = arrayLiteral.elements.filter((element) => getIdentifierText(element) !== 'NativeClass');
if (retained.length === arrayLiteral.elements.length) {
return statement;
}
if (retained.length === 0) {
return undefined;
}
const updatedArray = factory.updateArrayLiteralExpression(arrayLiteral, retained);
const updatedCall = factory.updateCallExpression(right, right.expression, right.typeArguments, [updatedArray, ...right.arguments.slice(1)]);
const updatedBinary = factory.updateBinaryExpression(expr, expr.left, expr.operatorToken, updatedCall);
return factory.updateExpressionStatement(statement, updatedBinary);
}
function removeNativeClassImport(factory, node) {
const clause = node.importClause;
if (!clause || !clause.namedBindings || !ts.isNamedImports(clause.namedBindings)) {
return node;
}
const remaining = clause.namedBindings.elements.filter((element) => {
const imported = element.propertyName ?? element.name;
return imported.text !== 'NativeClass';
});
if (remaining.length === clause.namedBindings.elements.length) {
return node;
}
if (remaining.length === 0 && !clause.name && !clause.isTypeOnly && !clause.phaseModifier) {
return undefined;
}
const updatedNamedImports = remaining.length ? factory.updateNamedImports(clause.namedBindings, remaining) : undefined;
const updatedClause = factory.updateImportClause(clause, clause.phaseModifier, clause.name, updatedNamedImports);
return factory.updateImportDeclaration(node, node.modifiers, updatedClause, node.moduleSpecifier, node.attributes);
}
function getIdentifierText(node) {
if (!node) {
return undefined;
}
if (ts.isIdentifier(node)) {
return node.text;
}
if (ts.isDecorator(node)) {
return getIdentifierText(node.expression);
}
if (ts.isCallExpression(node)) {
return getIdentifierText(node.expression);
}
if (ts.isPropertyAccessExpression(node)) {
return node.name.text;
}
if (ts.isParenthesizedExpression(node)) {
return getIdentifierText(node.expression);
}
return undefined;
}
function setParents(statements, parent) {
for (const statement of statements) {
setParentRecursive(statement, parent);
}
}
module.exports = { before };