chore: convert gulpfile to Typescript

.gitignore

@@ -23,6 +23,8 @@ build/
 coverage/
 dist/
 examples/**/app.yaml
+*.js
+*.map
 src/**/*.js
 src/**/*.map
 src/**/*.d.ts

gulpfile.js → gulpfile.ts

@@ -1,5 +1,5 @@
-const _spawn = require("child_process").spawn
-const { join } = require("path")
+import { spawn as _spawn, ChildProcess } from "child_process"
+import { join } from "path"
 
 const gulp = require("gulp")
 const cached = require("gulp-cached")
@@ -26,27 +26,28 @@ let destDir = "build"
 
 class TaskError extends Error {
   toString() {
-    return this.messsage
+    return this.message
   }
 }
 
 function setDestDir(path) {
   destDir = path
 }
 
-const children = []
+const children: ChildProcess[] = []
 
-process.env.FORCE_COLOR = true
+process.env.FORCE_COLOR = "true"
 
 function spawn(cmd, args, cb) {
   const child = _spawn(cmd, args, { stdio: "pipe", shell: true, env: process.env })
   children.push(child)
 
-  const output = []
-  child.stdout.on("data", (data) => output.push(data))
-  child.stderr.on("data", (data) => output.push(data))
+  const output: string[] = []
+  child.stdout.on("data", (data) => output.push(data.toString()))
+  child.stderr.on("data", (data) => output.push(data.toString()))
 
   child.on("exit", (code) => {
+    console.log(code)
     if (code !== 0) {
       console.log(output.join(""))
       die()
@@ -65,21 +66,21 @@ function die() {
 }
 
 gulp.task("check-licenses", (cb) =>
-  spawn("./bin/check-licenses", [], cb)
+  spawn("./bin/check-licenses", [], cb),
 )
 
 gulp.task("mocha", (cb) =>
-  spawn("node_modules/.bin/nyc", ["node_modules/.bin/mocha"], cb)
+  spawn("node_modules/.bin/nyc", ["node_modules/.bin/mocha"], cb),
 )
 
 gulp.task("pegjs", () =>
   gulp.src(pegjsSources)
     .pipe(pegjs({ format: "commonjs" }))
-    .pipe(gulp.dest(join(destDir, "src")))
+    .pipe(gulp.dest(join(destDir, "src"))),
 )
 
 gulp.task("pegjs-watch", () =>
-  gulp.watch(pegjsSources, gulp.parallel("pegjs"))
+  gulp.watch(pegjsSources, gulp.parallel("pegjs")),
 )
 
 gulp.task("static", () => {
@@ -98,7 +99,7 @@ gulp.task("tsc", () =>
     .pipe(tsProject(reporter))
     .on("error", die)
     .pipe(sourcemaps.write())
-    .pipe(gulp.dest(join(destDir, "src")))
+    .pipe(gulp.dest(join(destDir, "src"))),
 )
 
 gulp.task("tsc-watch", () =>
@@ -110,7 +111,7 @@ gulp.task("tsc-watch", () =>
       "--outDir", join(destDir, "src"),
     ],
     { stdio: "inherit" },
-  )
+  ),
 )
 
 gulp.task("tsfmt", (cb) => {
@@ -134,27 +135,28 @@ gulp.task("tslint", () =>
     .pipe(cached("tslint"))
     .pipe(gulpTslint({
       program: tslint.Linter.createProgram("./tsconfig.json"),
-      formatter: "verbose"
+      formatter: "verbose",
     }))
-    .pipe(gulpTslint.report())
+    .pipe(gulpTslint.report()),
 )
 
 gulp.task("tslint-tests", () =>
   gulp.src(testTsSources)
     .pipe(cached("tslint-tests"))
     .pipe(gulpTslint({
-      formatter: "verbose"
+      formatter: "verbose",
     }))
-    .pipe(gulpTslint.report())
+    .pipe(gulpTslint.report()),
 )
 
 gulp.task("tslint-watch", () =>
-  gulp.watch([tsSources, testTsSources], gulp.parallel("tslint", "tslint-tests"))
+  gulp.watch([tsSources, testTsSources], gulp.parallel("tslint", "tslint-tests")),
 )
 
 gulp.task("lint", gulp.parallel("check-licenses", "tslint", "tslint-tests", "tsfmt"))
 gulp.task("build", gulp.parallel("pegjs", "static", "tsc"))
 gulp.task("dist", gulp.series((done) => { setDestDir("dist"); done() }, "lint", "build"))
 gulp.task("test", gulp.parallel("build", "lint", "mocha"))
-gulp.task("watch", gulp.parallel("pegjs-watch", "static-watch", "tsc-watch", "tsfmt-watch", "tslint-watch"))
+gulp.task("watch",
+  gulp.parallel("pegjs-watch", "static-watch", "tsc-watch", "tsfmt-watch", "tslint-watch"))
 gulp.task("default", gulp.series("watch"))