Normalize paths when looking up items on outputCache (#1038)

* Normalize paths when looking up items on outputCache

* Tweak tests to be absolutely sure sourcemaps are working

src/index.spec.ts

@@ -189,7 +189,7 @@ describe('ts-node', function () {
         }
 
         expect(err.message).to.contain([
-          `${join(__dirname, '../tests/throw.ts')}:3`,
+          `${join(__dirname, '../tests/throw.ts')}:100`,
           '  bar () { throw new Error(\'this is a demo\') }',
           '                 ^',
           'Error: this is a demo'
@@ -206,7 +206,7 @@ describe('ts-node', function () {
         }
 
         expect(err.message).to.contain([
-          `${join(__dirname, '../tests/throw.ts')}:3`,
+          `${join(__dirname, '../tests/throw.ts')}:100`,
           '  bar () { throw new Error(\'this is a demo\') }',
           '                 ^'
         ].join('\n'))
@@ -611,7 +611,7 @@ describe('ts-node', function () {
       } catch (error) {
         expect(error.stack).to.contain([
           'Error: this is a demo',
-          `    at Foo.bar (${join(__dirname, '../tests/throw.ts')}:3:18)`
+          `    at Foo.bar (${join(__dirname, '../tests/throw.ts')}:100:18)`
         ].join('\n'))
 
         done()

src/index.ts

@@ -420,7 +420,7 @@ export function create (rawOptions: CreateOptions = {}): Register {
   sourceMapSupport.install({
     environment: 'node',
     retrieveFile (path: string) {
-      return outputCache.get(path)?.content || ''
+      return outputCache.get(normalizeSlashes(path))?.content || ''
     }
   })
 

tests/throw.ts

@@ -1,4 +1,101 @@
+// intentional whitespace to prove that sourcemaps are working.  Throw should happen on line 100.
+// 100 lines is meant to be far more space than the helper functions would take.
 class Foo {
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   constructor () { this.bar() }
   bar () { throw new Error('this is a demo') }
 }