Add TypeScript support.

If `typescript` is installed, add the tsify plugin.

If a syntax error occurs in a `.ts` file, recommend installing
`typescript`.

TODO: Catch and format errors from the typescript compiler.

Author: goto-bus-stop

lib/cmd-build.js

@@ -18,7 +18,13 @@ function build (entry, opts) {
   var basedir = utils.dirname(entry)
   var outdir = path.join(basedir, 'dist')
 
-  mkdirp(outdir, function (err) {
+  utils.hasDependency(basedir, 'electron', function (err, hasElectron) {
+    if (err) return console.error(err)
+    opts.electron = hasElectron
+    mkdirp(outdir, onoutdir)
+  })
+
+  function onoutdir (err) {
     if (err) return console.error(err)
 
     var bankaiOpts = {
@@ -232,7 +238,7 @@ function build (entry, opts) {
         }
       ], done)
     }
-  })
+  }
 }
 
 function clr (text, color) {

lib/cmd-start.js

@@ -1,15 +1,16 @@
 var getPort = require('get-port')
+var path = require('path')
 
-var isElectronProject = require('./is-electron-project')
+var hasDependency = require('./utils').hasDependency
 var http = require('./http-server')
 var bankai = require('../http')
 
 module.exports = start
 
 function start (entry, opts) {
-  isElectronProject(process.cwd(), function (err, bool) {
+  hasDependency(path.dirname(entry), 'electron', function (err, isElectron) {
     if (err) throw err
-    opts.electron = bool
+    opts.electron = isElectron
 
     var handler = bankai(entry, opts)
     var state = handler.state // TODO: move all UI code into this file

lib/graph-script.js

@@ -16,6 +16,7 @@ var tinyify = require('tinyify')
 var glslify = require('glslify')
 var brfs = require('brfs')
 
+var hasDependency = require('./utils').hasDependency
 var ttyError = require('./tty-error')
 var exorcise = require('./exorcise')
 
@@ -39,8 +40,20 @@ module.exports = node
 function node (state, createEdge) {
   assert.equal(typeof state.metadata.entry, 'string', 'state.metadata.entries should be type string')
 
+  var self = this
   this.emit('progress', 'scripts', 0)
 
+  hasDependency(state.metadata.entry, 'typescript', function (err, hasTypescript) {
+    if (err) {
+      self.emit('error', err)
+    } else {
+      state.metadata.typescript = hasTypescript
+    }
+    startNode.call(self, state, createEdge)
+  })
+}
+
+function startNode (state, createEdge) {
   var self = this
   var entry = state.metadata.entry
   var fullPaths = Boolean(state.metadata.fullPaths)
@@ -56,6 +69,10 @@ function node (state, createEdge) {
     })
   }
 
+  if (state.metadata.typescript) {
+    b.plugin('tsify')
+  }
+
   b.ignore('sheetify/insert')
   b.transform(sheetify)
   b.transform(glslify)
@@ -106,6 +123,8 @@ function node (state, createEdge) {
     b.bundle(function (err, bundle) {
       if (err) {
         delete err.stream
+        // HACK to tell ttyError whether we have TypeScript
+        err.hasTypeScript = state.metadata.typescript
         err = ttyError('scripts', 'browserify.bundle', err)
         return self.emit('error', 'scripts', 'browserify.bundle', err)
       }

lib/is-electron-project.js

@@ -4,6 +4,7 @@ var path = require('path')
 var fs = require('fs')
 
 var cwd = process.cwd()
+var typescriptRx = /\.tsx?$/
 
 module.exports = ttyError
 
@@ -15,6 +16,7 @@ function ttyError (src, sub, err) {
   var loc = err.loc
   var line = loc.line
   var col = loc.column + 1
+  var hasTypeScript = err.hasTypeScript
 
   var lineNum = String(line) + ' '
   var padLen = lineNum.length
@@ -38,6 +40,11 @@ function ttyError (src, sub, err) {
   str += clr(lineNum + '|', 'blue') + ` ${clr(code, 'white')}\n`
   str += clr(empty, 'blue') + clr(syntaxError, 'red') + '\n\n'
   str += clr(`Hmmm. We're having trouble parsing a file.`, 'white')
+  if (typescriptRx.test(longFilename) && !hasTypeScript) {
+    str += '\n\n'
+    str += clr(`To enable TypeScript in your project, install the TypeScript compiler: `, 'white') + '\n'
+    str += '  ' + clr('npm install --save-dev typescript', 'grey')
+  }
 
   err.pretty = str
   return err

lib/tty-error.js

@@ -2,6 +2,8 @@ var recursiveWatch = require('recursive-watch')
 var findup = require('findup')
 var Debug = require('debug')
 var path = require('path')
+var explain = require('explain-error')
+var fs = require('fs')
 
 // Figure out what directory the file is in.
 // Does nothing if a directory is passed.
@@ -93,3 +95,21 @@ try {
   }
 }
 exports.brotli = brotliCompress
+
+exports.hasDependency = function hasDependency (dirname, dep, cb) {
+  findup(dirname, 'package.json', function (err, dir) {
+    if (err) return cb(null, false)
+    fs.readFile(path.join(dir, 'package.json'), function (err, json) {
+      if (err) return cb(explain(err, 'bankai.hasDependency: error reading package.json'))
+
+      try {
+        var pkg = JSON.parse(json)
+        var hasTypeScriptDep = Boolean((pkg.dependencies && pkg.dependencies[dep]) ||
+          (pkg.devDependencies && pkg.devDependencies[dep]))
+        cb(null, hasTypeScriptDep)
+      } catch (err) {
+        if (err) return cb(explain(err, 'bankai.hasDependency: error parsing package.json'))
+      }
+    })
+  })
+}

lib/utils.js

@@ -72,6 +72,7 @@
     "tfilter": "^1.0.1",
     "through2": "^2.0.3",
     "tinyify": "^2.4.0",
+    "tsify": "^3.0.4",
     "v8-compile-cache": "^1.1.0",
     "wasm-brotli": "^1.0.2",
     "watchify": "^3.9.0",
@@ -87,6 +88,7 @@
     "rimraf": "^2.6.1",
     "standard": "^10.0.2",
     "tachyons": "^4.7.4",
-    "tape": "^4.7.0"
+    "tape": "^4.7.0",
+    "typescript": "^2.6.2"
   }
 }

package.json

@@ -1,3 +1,4 @@
+var async = require('async-collection')
 var dedent = require('dedent')
 var rimraf = require('rimraf')
 var mkdirp = require('mkdirp')
@@ -73,6 +74,60 @@ tape('output multiple bundles if `split-require` is used', function (assert) {
   })
 })
 
+tape('adds tsify if typescript is installed', function (assert) {
+  assert.plan(3)
+
+  var barePackage = JSON.stringify({
+    dependencies: {}
+  }, null, 2)
+  var tsPackage = JSON.stringify({
+    dependencies: {},
+    devDependencies: { typescript: '^2.6.2' }
+  }, null, 2)
+
+  var file = `
+    class Counter {
+      private count: number;
+      public next (): number {
+        return this.count++;
+      }
+    }
+    export = Counter
+  `
+
+  var tmpDirname = path.join(__dirname, '../tmp', 'js-pipeline-' + (Math.random() * 1e4).toFixed())
+  mkdirp.sync(tmpDirname)
+  fs.writeFileSync(path.join(tmpDirname, 'app.ts'), file)
+
+  async.series([
+    withoutTypescript,
+    withTypescript
+  ], assert.end)
+
+  function withoutTypescript (cb) {
+    fs.writeFileSync(path.join(tmpDirname, 'package.json'), barePackage)
+    var compiler = bankai(path.join(tmpDirname, 'app.ts'), { watch: false })
+    compiler.on('error', function (step, type, err) {
+      assert.equal(err.filename, path.join(tmpDirname, 'app.ts'))
+      cb()
+    })
+    compiler.scripts('bundle.js', function () {
+      assert.fail('should have failed')
+    })
+  }
+  function withTypescript (cb) {
+    fs.writeFileSync(path.join(tmpDirname, 'package.json'), tsPackage)
+
+    var compiler = bankai(path.join(tmpDirname, 'app.ts'), { watch: false })
+    compiler.on('error', assert.error)
+    compiler.scripts('bundle.js', function (err, res) {
+      assert.error(err, 'error compiling typescript')
+      assert.ok(res)
+      cb()
+    })
+  }
+})
+
 tape('use custom babel config for local files, but not for dependencies', function (assert) {
   assert.plan(2)