refactor migrate this._cwd logic to NodeDepper

depper.js

@@ -1,6 +1,5 @@
 // @ts-check
 /** @typedef {import('glsl-resolve')} GlslResolve */
-var path     = require('path')
 var Emitter  = require('events/')
 var inherits = require('inherits')
 var map      = require('map-limit')
@@ -70,7 +69,6 @@ var {
 /**
  * @typedef {Object} DepperOptions
  * @prop {Boolean} [async] Defines the mechanism flow resolution.
- * @prop {String} [cwd] The root directory of your shader. Defaults to process.cwd().
  * @prop {Function} [readFile] pass in a custom function reading files.
  * @prop {GlslResolve} [resolve] pass in a custom function for resolving require calls. It has the same signature as glsl-resolve.
  * @prop {Object<string, string>} [files] a filename/source object mapping of files to prepopulate the file cache with. Useful for overriding.
@@ -101,17 +99,12 @@ function Depper(opts) {
 
   this._cache      = {}
   this._fileCache  = parseFiles(Object.assign({}, opts.files) || {})
-  this._cwd        = opts.cwd || process.cwd()
 
   /** @type {TransformDefinition[]} */
   this._transforms = []
   /** @type {TransformDefinition[]} */
   this._globalTransforms = []
 
-  if (typeof this._cwd !== 'string') {
-    throw new Error('glslify-deps: cwd must be a string path')
-  }
-
   if (!opts.readFile) {
     throw new Error('glslify-deps: readFile must be defined')
   }
@@ -139,10 +132,9 @@ function Depper(opts) {
   }
 }
 
-Depper.prototype.inline = function(source, basedir, done) {
-  var inlineFile = path.resolve(basedir || this._cwd, this._inlineName)
+Depper.prototype.inline = function(source, filename, done) {
   this._inlineSource = source
-  return this.add(inlineFile, done)
+  return this.add(filename || this._inlineName, done)
 }
 
 /**
@@ -263,11 +255,16 @@ Depper.prototype.transform = function(transform, opts) {
  *
  *
  * @param {String|GlslTransform} transform
+ * @param {Object} [opts] The options will be pased to transformRequire function.
  * @param {(err: Error, transform?: GlslTransform) => any} [done] Applies if is defined
  * @return {Function}
  */
-Depper.prototype.resolveTransform = function(transform, done) {
-  var opts = { cwd: this._cwd }
+Depper.prototype.resolveTransform = function(transform, opts, done) {
+  if (typeof opts === 'function') {
+    done = opts
+    opts = {}
+  }
+
   var self = this
 
   if (typeof transform === 'function') {
@@ -444,7 +441,7 @@ Depper.prototype._resolveImports = function(imports, opts, done) {
 }
 
 Depper.prototype.readFile = function(filename, done) {
-  if (path.basename(filename) !== this._inlineName)
+  if (filename !== this._inlineName)
     return this._readFile(filename, done)
 
   if(this._async) {

node.js

@@ -1,7 +1,6 @@
 /** @typedef {import('./depper').DepperOptions} DepperOptions */
 var Depper   = require('./depper')
 var path     = require('path')
-var map      = require('map-limit')
 var inherits = require('inherits')
 var fs       = require('graceful-fs')
 var findup   = require('@choojs/findup')
@@ -32,6 +31,7 @@ function createDefaultRead() {
  *//**
  * @constructor
  * @param {DepperOptions} opts
+ * @param {String} [opts.cwd] The root directory of your shader. Defaults to process.cwd().
  */
 function NodeDepper(opts) {
   if (!(this instanceof NodeDepper)) return new NodeDepper(opts)
@@ -41,7 +41,24 @@ function NodeDepper(opts) {
   opts.transformRequire = opts.transformRequire || transformRequire.sync
   opts.readFile = opts.readFile || createDefaultRead()
   Depper.call(this, opts)
+
+  this._cwd        = opts.cwd || process.cwd()
   this._trCache    = {}
+
+  if (typeof this._cwd !== 'string') {
+    throw new Error('glslify-deps: cwd must be a string path')
+  }
+}
+
+/**
+ * @override
+ * @param {*} source
+ * @param {*} basedir
+ * @param {*} done
+ */
+NodeDepper.prototype.inline = function(source, basedir, done) {
+  var inlineFile = path.resolve(basedir || this._cwd, this._inlineName)
+  return Depper.prototype.inline.call(this, source, inlineFile, done);
 }
 
 /**
@@ -56,6 +73,34 @@ NodeDepper.prototype.add = function(filename, done) {
   }, done)
 }
 
+/**
+ * @override
+ * @param {String|GlslTransform} transform
+ * @param {(err: Error, transform?: GlslTransform) => any} [done] Applies if is defined
+ * @return {Function}
+ */
+NodeDepper.prototype.resolveTransform = function(transform, done) {
+  return Depper.prototype.resolveTransform.call(this, transform, {
+    cwd: this._cwd
+  }, done)
+}
+
+/**
+ * @override
+ * @param {*} filename
+ * @param {*} done
+ */
+NodeDepper.prototype.readFile = function(filename, done) {
+  if (path.basename(filename) !== this._inlineName)
+    return this._readFile(filename, done)
+
+  if(this._async) {
+    return done(null, this._inlineSource)
+  }
+  return this._inlineSource
+}
+
+
 /**
  * Determines which transforms to use for a particular file.
  * The rules here are the same you see in browserify: