Use glob

src/index.ts

@@ -3,12 +3,15 @@ import getInputs from './inputs'
 import setOutputs from './outputs'
 import install from './install'
 
-const inputs = getInputs()
-
-install(inputs).then(() => {
+async function main() {
+  const inputs = await getInputs()
+  await install(inputs).then(() => {
     console.log('Installation Completed!')
     setOutputs(inputs)
-}).catch(error => {
+  })
+}
+
+main().catch(error => {
   console.error(error)
   setFailed(error)
 })

src/inputs/index.ts

@@ -1,4 +1,6 @@
-import { getInput, InputOptions } from '@actions/core'
+import { inspect } from 'util'
+import { getInput, error, InputOptions } from '@actions/core'
+import * as glob from '@actions/glob'
 
 export interface Inputs {
   readonly version: string
@@ -11,10 +13,21 @@ const options: InputOptions = {
   required: true,
 }
 
-export const getInputs = (): Inputs => ({
+async function parsePath(pattern: string, inputName: string) {
+  const builder = await glob.create(pattern)
+  const paths = await builder.glob()
+  if (paths.length !== 1) {
+    error(`Input ${inputName} is expected to match 1 path, but it matches ${paths.length}: ${inspect(paths)}`)
+  }
+  return paths[0]
+}
+
+const parseInputPath = (name: string) => parsePath(getInput(name, options), name)
+
+export const getInputs = async (): Promise<Inputs> => ({
   version: getInput('version', options),
-  dest: getInput('dest', options),
-  binDest: getInput('bin_dest', options),
+  dest: await parseInputPath('dest'),
+  binDest: await parseInputPath('bin_dest'),
   registry: getInput('registry', options),
 })