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transformers.ts
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import * as ts from "typescript";
// TODO: Don't depend on CLI?
import * as cliDiagnostics from "../cli/diagnostics";
import { CompilerOptions, TransformerImport } from "../CompilerOptions";
import * as diagnosticFactories from "./diagnostics";
import { getConfigDirectory, resolvePlugin } from "./utils";
export function getTransformers(
program: ts.Program,
diagnostics: ts.Diagnostic[],
customTransformers: ts.CustomTransformers,
onSourceFile: (sourceFile: ts.SourceFile) => void
): ts.CustomTransformers {
const luaTransformer: ts.TransformerFactory<ts.SourceFile> = () => sourceFile => {
onSourceFile(sourceFile);
return ts.createSourceFile(sourceFile.fileName, "", ts.ScriptTarget.ESNext);
};
const transformersFromOptions = loadTransformersFromOptions(program, diagnostics);
const afterDeclarations = [
...(transformersFromOptions.afterDeclarations ?? []),
...(customTransformers.afterDeclarations ?? []),
];
const options = program.getCompilerOptions() as CompilerOptions;
if (options.noImplicitSelf) {
afterDeclarations.unshift(noImplicitSelfTransformer);
}
return {
afterDeclarations,
before: [
...(customTransformers.before ?? []),
...(transformersFromOptions.before ?? []),
...(transformersFromOptions.after ?? []),
...(customTransformers.after ?? []),
stripParenthesisExpressionsTransformer,
luaTransformer,
],
};
}
export const noImplicitSelfTransformer: ts.TransformerFactory<ts.SourceFile | ts.Bundle> = () => node => {
const transformSourceFile: ts.Transformer<ts.SourceFile> = node => {
const empty = ts.factory.createNotEmittedStatement(undefined!);
ts.addSyntheticLeadingComment(empty, ts.SyntaxKind.MultiLineCommentTrivia, "* @noSelfInFile ", true);
return ts.factory.updateSourceFile(node, [empty, ...node.statements], node.isDeclarationFile);
};
return ts.isBundle(node)
? ts.factory.updateBundle(node, node.sourceFiles.map(transformSourceFile))
: transformSourceFile(node);
};
export const stripParenthesisExpressionsTransformer: ts.TransformerFactory<ts.SourceFile> = context => sourceFile => {
// Remove parenthesis expressions before transforming to Lua, so transpiler is not hindered by extra ParenthesizedExpression nodes
function unwrapParentheses(node: ts.Expression) {
while (ts.isParenthesizedExpression(node) && !ts.isOptionalChain(node.expression)) {
node = node.expression;
}
return node;
}
function visit(node: ts.Node): ts.Node {
// For now only call expressions strip their expressions of parentheses, there could be more cases where this is required
if (ts.isCallExpression(node)) {
return ts.factory.updateCallExpression(
node,
unwrapParentheses(node.expression),
node.typeArguments,
node.arguments
);
} else if (ts.isVoidExpression(node)) {
return ts.factory.updateVoidExpression(node, unwrapParentheses(node.expression));
} else if (ts.isDeleteExpression(node)) {
return ts.factory.updateDeleteExpression(node, unwrapParentheses(node.expression));
}
return ts.visitEachChild(node, visit, context);
}
return ts.visitEachChild(sourceFile, visit, context);
};
function loadTransformersFromOptions(program: ts.Program, diagnostics: ts.Diagnostic[]): ts.CustomTransformers {
const customTransformers: Required<ts.CustomTransformers> = {
before: [],
after: [],
afterDeclarations: [],
};
const options = program.getCompilerOptions() as CompilerOptions;
if (options.plugins) {
for (const [index, transformerImport] of options.plugins.entries()) {
if (!("transform" in transformerImport)) continue;
const optionName = `compilerOptions.plugins[${index}]`;
const { error: resolveError, result: factory } = resolvePlugin(
"transformer",
`${optionName}.transform`,
getConfigDirectory(options),
transformerImport.transform,
transformerImport.import
);
if (resolveError) diagnostics.push(resolveError);
if (factory === undefined) continue;
const { error: loadError, transformer } = loadTransformer(optionName, program, factory, transformerImport);
if (loadError) diagnostics.push(loadError);
if (transformer === undefined) continue;
if (transformer.before) {
customTransformers.before.push(transformer.before);
}
if (transformer.after) {
customTransformers.after.push(transformer.after);
}
if (transformer.afterDeclarations) {
customTransformers.afterDeclarations.push(transformer.afterDeclarations);
}
}
}
if (options.jsx === ts.JsxEmit.React) {
customTransformers.before.push(context => {
// if target < ES2017, typescript generates some unnecessary additional transformations in transformJSX.
// We can't control the target compiler option, so we override here.
const patchedContext: ts.TransformationContext = {
...context,
getCompilerOptions: () => ({
...context.getCompilerOptions(),
target: ts.ScriptTarget.ESNext,
}),
};
return ts.transformJsx(patchedContext);
});
}
return customTransformers;
}
type ProgramTransformerFactory = (program: ts.Program, options: Record<string, any>) => Transformer;
type ConfigTransformerFactory = (options: Record<string, any>) => Transformer;
type CompilerOptionsTransformerFactory = (
compilerOptions: CompilerOptions,
options: Record<string, any>
) => Transformer;
type TypeCheckerTransformerFactory = (typeChecker: ts.TypeChecker, options: Record<string, any>) => Transformer;
type RawTransformerFactory = Transformer;
type Transformer = GroupTransformer | ts.TransformerFactory<ts.SourceFile>;
interface GroupTransformer {
before?: ts.TransformerFactory<ts.SourceFile>;
after?: ts.TransformerFactory<ts.SourceFile>;
afterDeclarations?: ts.TransformerFactory<ts.SourceFile | ts.Bundle>;
}
function loadTransformer(
optionPath: string,
program: ts.Program,
factory: unknown,
{ transform, after = false, afterDeclarations = false, type = "program", ...extraOptions }: TransformerImport
): { error?: ts.Diagnostic; transformer?: GroupTransformer } {
let transformer: Transformer;
switch (type) {
case "program":
transformer = (factory as ProgramTransformerFactory)(program, extraOptions);
break;
case "config":
transformer = (factory as ConfigTransformerFactory)(extraOptions);
break;
case "checker":
transformer = (factory as TypeCheckerTransformerFactory)(program.getTypeChecker(), extraOptions);
break;
case "raw":
transformer = factory as RawTransformerFactory;
break;
case "compilerOptions":
transformer = (factory as CompilerOptionsTransformerFactory)(program.getCompilerOptions(), extraOptions);
break;
default: {
const optionName = `--${optionPath}.type`;
return { error: cliDiagnostics.argumentForOptionMustBe(optionName, "program") };
}
}
if (typeof after !== "boolean") {
const optionName = `${optionPath}.after`;
return { error: cliDiagnostics.compilerOptionRequiresAValueOfType(optionName, "boolean") };
}
if (typeof afterDeclarations !== "boolean") {
const optionName = `${optionPath}.afterDeclarations`;
return { error: cliDiagnostics.compilerOptionRequiresAValueOfType(optionName, "boolean") };
}
if (typeof transformer === "function") {
let wrappedTransformer: GroupTransformer;
if (after) {
wrappedTransformer = { after: transformer };
} else if (afterDeclarations) {
wrappedTransformer = { afterDeclarations: transformer as ts.TransformerFactory<ts.SourceFile | ts.Bundle> };
} else {
wrappedTransformer = { before: transformer };
}
return { transformer: wrappedTransformer };
} else {
const isValidGroupTransformer =
typeof transformer === "object" &&
(transformer.before ?? transformer.after ?? transformer.afterDeclarations) !== undefined;
if (!isValidGroupTransformer) {
return { error: diagnosticFactories.transformerShouldBeATsTransformerFactory(transform) };
}
}
return { transformer };
}