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feat(bindings/ts): Add transform/strip-only mode (#9138)
**Description:** This PR adds `strip-only`/`transform` mode to `@swc/wasm-typescript`. - Both mode errors on decorator usages. - In `strip-only` mode, `enum` and TypeScript parameter properties are treated as an invalid syntax. - In `transform` mode, those are transpiled.
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Donny/강동윤
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@ -13,9 +13,6 @@ bench = false
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crate-type = ["cdylib"]
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[features]
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default = ["swc_v1"]
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swc_v1 = []
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swc_v2 = []
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[dependencies]
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anyhow = "1.0.66"
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@ -0,0 +1,32 @@
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// Jest Snapshot v1, https://goo.gl/fbAQLP
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exports[`transform in strip-only mode should throw an error when it encounters an enum 1`] = `
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"
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x TypeScript enum is not supported in strip-only mode
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,----
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1 | enum Foo {}
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: ^^^^^^^^^^^
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\`----
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"
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`;
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exports[`transform in strip-only mode should throw an error with a descriptive message when it encounters a decorator 1`] = `
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"
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x Decorators are not supported
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,----
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1 | class Foo { @decorator foo() {} }
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: ^^^^^^^^^^
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\`----
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"
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`;
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exports[`transform in transform mode should transpile enum 1`] = `
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"var Foo;
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(function(Foo) {})(Foo || (Foo = {}));
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"
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`;
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exports[`transform should strip types 1`] = `
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"export const foo = 1;
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"
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`;
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@ -6,7 +6,7 @@ it("properly reports error", function () {
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}).toThrow();
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});
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describe("trannsform", () => {
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describe("transform", () => {
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it("should strip types", async () => {
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const { code } = await swc.transform(
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`
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@ -15,26 +15,36 @@ describe("trannsform", () => {
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`,
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{}
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);
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expect(code).toMatchInlineSnapshot(`
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"export const foo = 1;
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"
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`);
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expect(code).toMatchSnapshot();
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});
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it("should preserve enum", async () => {
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const { code } = await swc.transform(
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`
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enum Foo {
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Bar
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}
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`,
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{}
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);
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await expect(code).toMatchInlineSnapshot(`
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"enum Foo {
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Bar
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}
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"
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`);
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describe("in strip-only mode", () => {
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it("should throw an error when it encounters an enum", async () => {
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await expect(
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swc.transform("enum Foo {}", {
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mode: "strip-only",
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})
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).rejects.toMatchSnapshot();
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});
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it('should throw an error with a descriptive message when it encounters a decorator', async () => {
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await expect(
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swc.transform("class Foo { @decorator foo() {} }", {
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mode: "strip-only",
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})
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).rejects.toMatchSnapshot();
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})
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});
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describe("in transform mode", () => {
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it("should transpile enum", async () => {
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const { code } = await swc.transform("enum Foo {}", {
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mode: "transform",
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});
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expect(code).toMatchSnapshot();
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});
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});
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});
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@ -1,5 +1,5 @@
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{
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"devDependencies": {
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"jest": "^25.1.0"
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"jest": "^29.7.0"
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}
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}
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@ -2,11 +2,14 @@ use anyhow::{Context, Error};
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use serde::{Deserialize, Serialize};
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use swc_core::{
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common::{
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comments::SingleThreadedComments, errors::ColorConfig, source_map::SourceMapGenConfig,
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sync::Lrc, FileName, Mark, SourceMap, GLOBALS,
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comments::SingleThreadedComments,
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errors::{ColorConfig, HANDLER},
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source_map::SourceMapGenConfig,
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sync::Lrc,
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FileName, Mark, SourceMap, Spanned, GLOBALS,
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},
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ecma::{
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ast::{EsVersion, Program},
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ast::{Decorator, EsVersion, Program, TsEnumDecl, TsParamPropParam},
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codegen::text_writer::JsWriter,
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parser::{
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parse_file_as_module, parse_file_as_program, parse_file_as_script, Syntax, TsSyntax,
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@ -18,9 +21,9 @@ use swc_core::{
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hygiene::hygiene,
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resolver,
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},
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typescript::strip_type,
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typescript::{strip_type, typescript},
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},
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visit::VisitMutWith,
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visit::{Visit, VisitMutWith, VisitWith},
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},
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};
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use swc_error_reporters::handler::{try_with_handler, HandlerOpts};
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@ -46,7 +49,7 @@ pub struct Options {
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#[serde(default)]
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pub filename: Option<String>,
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#[serde(default)]
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#[serde(default = "default_ts_syntax")]
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pub parser: TsSyntax,
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#[serde(default)]
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@ -55,12 +58,31 @@ pub struct Options {
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#[serde(default)]
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pub source_maps: bool,
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// #[serde(default)]
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// pub transform: swc_core::ecma::transforms::typescript::Config,
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#[serde(default)]
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pub mode: Mode,
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#[serde(default)]
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pub transform: Option<swc_core::ecma::transforms::typescript::Config>,
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#[serde(default)]
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pub codegen: swc_core::ecma::codegen::Config,
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}
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fn default_ts_syntax() -> TsSyntax {
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TsSyntax {
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decorators: true,
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..Default::default()
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}
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}
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#[derive(Clone, Copy, Default, Deserialize)]
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#[serde(rename_all = "kebab-case")]
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pub enum Mode {
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#[default]
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StripOnly,
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Transform,
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}
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#[derive(Serialize)]
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pub struct TransformOutput {
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code: String,
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@ -142,7 +164,6 @@ fn operate(input: String, options: Options) -> Result<TransformOutput, Error> {
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let unresolved_mark = Mark::new();
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let top_level_mark = Mark::new();
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HELPERS.set(&Helpers::new(options.external_helpers), || {
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// Apply resolver
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@ -150,7 +171,19 @@ fn operate(input: String, options: Options) -> Result<TransformOutput, Error> {
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// Strip typescript types
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program.visit_mut_with(&mut strip_type());
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program.visit_with(&mut Validator { mode: options.mode });
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match options.mode {
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Mode::StripOnly => {
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program.visit_mut_with(&mut strip_type());
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}
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Mode::Transform => {
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program.visit_mut_with(&mut typescript(
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options.transform.unwrap_or_default(),
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top_level_mark,
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));
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}
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}
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// Apply external helpers
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@ -217,3 +250,43 @@ impl SourceMapGenConfig for TsSourceMapGenConfig {
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f.to_string()
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}
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}
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struct Validator {
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mode: Mode,
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}
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impl Visit for Validator {
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fn visit_decorator(&mut self, n: &Decorator) {
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HANDLER.with(|handler| {
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handler.span_err(n.span, "Decorators are not supported");
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});
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}
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fn visit_ts_enum_decl(&mut self, e: &TsEnumDecl) {
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if matches!(self.mode, Mode::StripOnly) {
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HANDLER.with(|handler| {
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handler.span_err(
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e.span,
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"TypeScript enum is not supported in strip-only mode",
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);
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});
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return;
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}
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e.visit_children_with(self);
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}
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fn visit_ts_param_prop_param(&mut self, n: &TsParamPropParam) {
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if matches!(self.mode, Mode::StripOnly) {
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HANDLER.with(|handler| {
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handler.span_err(
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n.span(),
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"TypeScript parameter property is not supported in strip-only mode",
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);
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});
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return;
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}
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n.visit_children_with(self);
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}
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}
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