feat(typescript): add allow_js support to ts_project

Author: Matt Insler

packages/typescript/internal/ts_project.bzl

@@ -215,6 +215,7 @@ def _validate_options_impl(ctx):
 
     arguments = ctx.actions.args()
     arguments.add_all([ctx.file.tsconfig.path, marker.path, ctx.attr.target, struct(
+        allow_js = ctx.attr.allow_js,
         declaration = ctx.attr.declaration,
         declaration_map = ctx.attr.declaration_map,
         composite = ctx.attr.composite,
@@ -244,6 +245,7 @@ def _validate_options_impl(ctx):
 validate_options = rule(
     implementation = _validate_options_impl,
     attrs = {
+        "allow_js": attr.bool(),
         "composite": attr.bool(),
         "declaration": attr.bool(),
         "declaration_map": attr.bool(),
@@ -258,12 +260,17 @@ validate_options = rule(
     },
 )
 
-def _out_paths(srcs, outdir, rootdir, ext):
+def _is_ts_src(src, allow_js):
+    if not src.endswith(".d.ts") and (src.endswith(".ts") or src.endswith(".tsx")):
+        return True
+    return allow_js and (src.endswith(".js") or src.endswith(".jsx"))
+
+def _out_paths(srcs, outdir, rootdir, allow_js, ext):
     rootdir_replace_pattern = rootdir + "/" if rootdir else ""
     return [
         _join(outdir, f[:f.rindex(".")].replace(rootdir_replace_pattern, "") + ext)
         for f in srcs
-        if not f.endswith(".d.ts") and (f.endswith(".ts") or f.endswith(".tsx"))
+        if _is_ts_src(f, allow_js)
     ]
 
 def ts_project_macro(
@@ -273,6 +280,7 @@ def ts_project_macro(
         args = [],
         deps = [],
         extends = None,
+        allow_js = False,
         declaration = False,
         source_map = False,
         declaration_map = False,
@@ -456,6 +464,9 @@ def ts_project_macro(
             will appear in bazel-out/[arch]/bin/path/to/my/package/foo/*.js.
             By default the out_dir is '.', meaning the packages folder in bazel-out.
 
+        allow_js: boolean; Specifies whether TypeScript will read .js and .jsx files. When used with declaration,
+            TypeScript will generate .d.ts files from .js files.
+
         declaration_dir: a string specifying a subdirectory under the bazel-out folder where generated declaration
             outputs are written. Equivalent to the TypeScript --declarationDir option.
             By default declarations are written to the out_dir.
@@ -482,7 +493,10 @@ def ts_project_macro(
     """
 
     if srcs == None:
-        srcs = native.glob(["**/*.ts", "**/*.tsx"])
+        if allow_js == True:
+            srcs = native.glob(["**/*.ts", "**/*.tsx", "**/*.js", "**/*.jsx"])
+        else:
+            srcs = native.glob(["**/*.ts", "**/*.tsx"])
     extra_deps = []
 
     if type(extends) == type([]):
@@ -497,6 +511,7 @@ def ts_project_macro(
         declaration = compiler_options.setdefault("declaration", declaration)
         declaration_map = compiler_options.setdefault("declarationMap", declaration_map)
         emit_declaration_only = compiler_options.setdefault("emitDeclarationOnly", emit_declaration_only)
+        allow_js = compiler_options.setdefault("allowJs", allow_js)
 
         # These options are always passed on the tsc command line so don't include them
         # in the tsconfig. At best they're redundant, but at worst we'll have a conflict
@@ -535,6 +550,7 @@ def ts_project_macro(
                 incremental = incremental,
                 ts_build_info_file = ts_build_info_file,
                 emit_declaration_only = emit_declaration_only,
+                allow_js = allow_js,
                 tsconfig = tsconfig,
                 extends = extends,
             )
@@ -553,10 +569,10 @@ def ts_project_macro(
         declaration_dir = declaration_dir,
         out_dir = out_dir,
         root_dir = root_dir,
-        js_outs = _out_paths(srcs, out_dir, root_dir, ".js") if not emit_declaration_only else [],
-        map_outs = _out_paths(srcs, out_dir, root_dir, ".js.map") if source_map and not emit_declaration_only else [],
-        typings_outs = _out_paths(srcs, typings_out_dir, root_dir, ".d.ts") if declaration or composite else [],
-        typing_maps_outs = _out_paths(srcs, typings_out_dir, root_dir, ".d.ts.map") if declaration_map else [],
+        js_outs = _out_paths(srcs, out_dir, root_dir, False, ".js") if not emit_declaration_only else [],
+        map_outs = _out_paths(srcs, out_dir, root_dir, False, ".js.map") if source_map and not emit_declaration_only else [],
+        typings_outs = _out_paths(srcs, typings_out_dir, root_dir, allow_js, ".d.ts") if declaration or composite else [],
+        typing_maps_outs = _out_paths(srcs, typings_out_dir, root_dir, allow_js, ".d.ts.map") if declaration_map else [],
         buildinfo_out = tsbuildinfo_path if composite or incremental else None,
         tsc = tsc,
         link_workspace_root = link_workspace_root,

packages/typescript/internal/ts_project_options_validator.ts

@@ -64,6 +64,7 @@ function main([tsconfigPath, output, target, attrsStr]: string[]): 0|1 {
     }
   }
 
+  check('allowJs', 'allow_js');
   check('declarationMap', 'declaration_map');
   check('emitDeclarationOnly', 'emit_declaration_only');
   check('sourceMap', 'source_map');
@@ -89,6 +90,7 @@ function main([tsconfigPath, output, target, attrsStr]: string[]): 0|1 {
   require('fs').writeFileSync(
       output, `
 // ${process.argv[1]} checked attributes for ${target}
+// allow_js:              ${attrs.allow_js}
 // composite:             ${attrs.composite}
 // declaration:           ${attrs.declaration}
 // declaration_map:       ${attrs.declaration_map}

packages/typescript/test/ts_project/allow_js/BUILD.bazel

@@ -0,0 +1,36 @@
+load("@build_bazel_rules_nodejs//:index.bzl", "nodejs_test")
+load("//packages/typescript:index.bzl", "ts_project")
+
+# Ensure that a.js produces outDir/a.js and outDir/a.d.ts
+SRCS = [
+    "a.js",
+]
+
+ts_project(
+    name = "tsconfig",
+    srcs = SRCS,
+    allow_js = True,
+    declaration = True,
+    declaration_map = True,
+    out_dir = "out",
+    source_map = True,
+)
+
+filegroup(
+    name = "types",
+    srcs = [":tsconfig"],
+    output_group = "types",
+)
+
+nodejs_test(
+    name = "test",
+    data = [
+        ":tsconfig",
+        ":types",
+    ],
+    entry_point = "verify.js",
+    templated_args = [
+        "$(locations :types)",
+        "$(locations :tsconfig)",
+    ],
+)

packages/typescript/test/ts_project/allow_js/a.js

@@ -0,0 +1,3 @@
+'use strict';
+exports.__esModule = true;
+exports.a = 'a';

packages/typescript/test/ts_project/allow_js/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "compilerOptions": {
+      "allowJs": true,
+      "sourceMap": true,
+      "declaration": true,
+      "declarationMap": true,
+      "types": []
+  }
+}

packages/typescript/test/ts_project/allow_js/verify.js

@@ -0,0 +1,6 @@
+const assert = require('assert');
+
+const types_files = process.argv.slice(2, 4);
+const code_files = process.argv.slice(4, 6);
+assert.ok(types_files.some(f => f.endsWith('out/a.d.ts')), 'Missing a.d.ts');
+assert.ok(types_files.some(f => f.endsWith('out/a.d.ts.map')), 'Missing a.d.ts.map');