Added checks to make sure the specified track exists

Added precondition checks to validate input files and paths to return more informative error messages as per #2

node_modules/ts-jest/presets/create.js

@@ -0,0 +1 @@
+module.exports = require('../dist/config/create-jest-preset').createJestPreset

node_modules/ts-jest/presets/default/jest-preset.js

@@ -0,0 +1 @@
+module.exports = require('..').defaults

node_modules/ts-jest/presets/index.d.ts

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+import { TsJestPresets } from '../dist/config/create-jest-preset'
+
+export const defaults: TsJestPresets
+export const jsWithTs: TsJestPresets
+export const jsWithBabel: TsJestPresets

node_modules/ts-jest/presets/index.js

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+const create = require('./create')
+
+module.exports = {
+  get defaults() { return create() },
+  get jsWithTs() { return create({ allowJs: true }) },
+  get jsWithBabel() {
+    return create({ allowJs: false }, {
+      transform: {
+        '^.+\\.jsx?$': 'babel-jest',
+      },
+    })
+  },
+}

node_modules/ts-jest/presets/js-with-babel/jest-preset.js

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+module.exports = require('..').jsWithBabel

node_modules/ts-jest/presets/js-with-ts/jest-preset.js

@@ -0,0 +1 @@
+module.exports = require('..').jsWithTs