fix: shim non-existent source

src/index.ts

@@ -263,36 +263,38 @@ interface RuntimeInfo {
  * @return Promise of infomation of runtime of `target`.
  */
 async function searchScriptRuntime (target: string, opts: InternalOptions): Promise<RuntimeInfo> {
+  let shebang;
   try {
     const data = await opts.fs_.readFile(target, 'utf8')
 
     // First, check if the bin is a #! of some sort.
     const firstLine = data.trim().split(/\r*\n/)[0]
-    const shebang = firstLine.match(shebangExpr)
-    if (!shebang) {
-      // If not, infer script type from its extension.
-      // If the inference fails, it's something that'll be compiled, or some other
-      // sort of script, and just call it directly.
-      const targetExtension = path.extname(target).toLowerCase()
-      return {
-        // undefined if extension is unknown but it's converted to null.
-        program: extensionToProgramMap.get(targetExtension) || null,
-        additionalArgs: ''
+    shebang = firstLine.match(shebangExpr)
+  } catch (err: any) {
+    if (isWindows() && err.code === 'ENOENT') {
+      if (await opts.fs_.stat(`${target}${getExeExtension()}`)) {
+        return {
+          program: null,
+          additionalArgs: '',
+        }
       }
     }
+    if (err.code !== 'ENOENT') throw err
+  }
+  if (!shebang) {
+    // If not, infer script type from its extension.
+    // If the inference fails, it's something that'll be compiled, or some other
+    // sort of script, and just call it directly.
+    const targetExtension = path.extname(target).toLowerCase()
     return {
-      program: shebang[1],
-      additionalArgs: shebang[2]
-    }
-  } catch (err: any) {
-    if (!isWindows() || err.code !== 'ENOENT') throw err
-    if (await opts.fs_.stat(`${target}${getExeExtension()}`)) {
-      return {
-        program: null,
-        additionalArgs: '',
-      }
+      // undefined if extension is unknown but it's converted to null.
+      program: extensionToProgramMap.get(targetExtension) || null,
+      additionalArgs: ''
     }
-    throw err
+  }
+  return {
+    program: shebang[1],
+    additionalArgs: shebang[2]
   }
 }
 

test/__snapshots__/test.js.snap

@@ -736,6 +736,22 @@ exit $LASTEXITCODE
 "
 `;
 
+exports[`no src file missing.shim 1`] = `
+"#!/bin/sh
+basedir=$(dirname \\"$(echo \\"$0\\" | sed -e 's,\\\\\\\\,/,g')\\")
+
+case \`uname\` in
+    *CYGWIN*) basedir=\`cygpath -w \\"$basedir\\"\`;;
+esac
+
+if [ -x \\"$basedir/node\\" ]; then
+  exec \\"$basedir/node\\"  \\"$basedir/missing.js\\" \\"$@\\"
+else
+  exec node  \\"$basedir/missing.js\\" \\"$@\\"
+fi
+"
+`;
+
 exports[`shebang with -S from.env.S.shim 1`] = `
 "#!/bin/sh
 basedir=$(dirname \\"$(echo \\"$0\\" | sed -e 's,\\\\\\\\,/,g')\\")

test/test.js

@@ -19,6 +19,17 @@ function testFile (fileName, lineEnding = '\n') {
   })
 }
 
+describe('no src file', () => {
+  const src = path.resolve(fixtures, 'missing.js')
+  const to = path.resolve(fixtures, 'missing.shim')
+
+  beforeAll(() => {
+    return cmdShim(src, to, { createCmdFile: false, fs })
+  })
+
+  testFile(to)
+})
+
 describe('no cmd file', () => {
   const src = path.resolve(fixtures, 'src.exe')
   const to = path.resolve(fixtures, 'exe.shim')