diff --git a/src/bin.ts b/src/bin.ts
index 1e8734229..e53cc1e9e 100644
--- a/src/bin.ts
+++ b/src/bin.ts
@@ -32,6 +32,7 @@ const args = arg({
   '--pretty': Boolean,
   '--skip-project': Boolean,
   '--skip-ignore': Boolean,
+  '--unsafe-ext-order': Boolean,
 
   // Aliases.
   '-e': '--eval',
@@ -62,6 +63,7 @@ const {
   '--type-check': typeCheck = DEFAULTS.typeCheck,
   '--pretty': pretty = DEFAULTS.pretty,
   '--skip-project': skipProject = DEFAULTS.skipProject,
+  '--unsafe-ext-order': unsafeExtOrder = DEFAULTS.unsafeExtOrder,
   '--skip-ignore': skipIgnore = DEFAULTS.skipIgnore
 } = args
 
@@ -89,6 +91,7 @@ Options:
   --pretty                       Use pretty diagnostic formatter
   --skip-project                 Skip reading \`tsconfig.json\`
   --skip-ignore                  Skip \`--ignore\` checks
+  --unsafe-ext-order             Un-Safe use TypeScript file first instead of JavaScript
 `)
 
   process.exit(0)
@@ -114,6 +117,7 @@ const service = register({
   project,
   skipIgnore,
   skipProject,
+  unsafeExtOrder,
   compiler,
   ignoreDiagnostics,
   compilerOptions,
diff --git a/src/index.ts b/src/index.ts
index 52a2d077c..c6503d50c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -65,6 +65,7 @@ export interface Options {
   project?: string
   skipIgnore?: boolean | null
   skipProject?: boolean | null
+  unsafeExtOrder?: boolean | null
   compilerOptions?: object
   ignoreDiagnostics?: Array<number | string>
   readFile?: (path: string) => string | undefined
@@ -104,6 +105,7 @@ export const DEFAULTS: Options = {
   project: process.env['TS_NODE_PROJECT'],
   skipIgnore: yn(process.env['TS_NODE_SKIP_IGNORE']),
   skipProject: yn(process.env['TS_NODE_SKIP_PROJECT']),
+  unsafeExtOrder: yn(process.env['TS_NODE_UNSAFE_EXT_ORDER']),
   ignoreDiagnostics: split(process.env['TS_NODE_IGNORE_DIAGNOSTICS']),
   typeCheck: yn(process.env['TS_NODE_TYPE_CHECK']),
   transpileOnly: yn(process.env['TS_NODE_TRANSPILE_ONLY'])
@@ -374,9 +376,7 @@ export function register (opts: Options = {}): Register {
   const register: Register = { cwd, compile, getTypeInfo, extensions, ts }
 
   // Register the extensions.
-  extensions.forEach(extension => {
-    registerExtension(extension, ignore, register, originalJsHandler)
-  })
+  registerHandler(opts, extensions, ignore, register, originalJsHandler)
 
   return register
 }
@@ -390,6 +390,40 @@ function shouldIgnore (filename: string, ignore: RegExp[]) {
   return ignore.some(x => x.test(relname))
 }
 
+/**
+ * unsafe re-order and make .ts > .js
+ */
+function registerHandler (
+  opts: Options,
+  extensions: string[],
+  ignore: RegExp[],
+  register: Register,
+  originalJsHandler: (m: NodeModule, filename: string) => any
+) {
+  if (opts.unsafeExtOrder) {
+    // @todo a better way with options
+    ['.ts', '.tsx']
+      .concat(Object.keys(require.extensions), extensions)
+      .filter(function (element, index, array: string[]) {
+        return array.indexOf(element) === index
+      })
+      .forEach(function (ext) {
+        if (extensions.indexOf(ext) !== -1) {
+          registerExtension(ext, ignore, register, originalJsHandler)
+        }
+
+        const old = require.extensions[ext]
+
+        delete require.extensions[ext]
+        require.extensions[ext] = old
+      })
+  } else {
+    extensions.forEach(function (ext) {
+      registerExtension(ext, ignore, register, originalJsHandler)
+    })
+  }
+}
+
 /**
  * Register the extension for node.
  */