refactor: make ajv a peerDependency

Author: pimlie

.babelrc

@@ -1,8 +1,9 @@
 {
+  "plugins": ["@babel/plugin-syntax-dynamic-import"],
   "env": {
     "test": {
       "presets": [
-        [ "@babel/preset-env", {
+        [ "@babel/env", {
           "targets": { "node": "current" }
         }]
       ]

package.json

@@ -13,11 +13,11 @@
     "test": "run-s test:*"
   },
   "dependencies": {
-    "ajv": "^6.10.2",
     "os-locale": "^4.0.0",
     "semver": "^6.3.0"
   },
   "devDependencies": {
+    "@babel/plugin-syntax-dynamic-import": "^7.7.4",
     "@babel/preset-env": "^7.7.4",
     "@nuxtjs/eslint-config": "^2.0.0",
     "ajv-cli": "^3.0.0",
@@ -27,5 +27,8 @@
     "eslint": "^6.7.1",
     "jest": "^24.9.0",
     "npm-run-all": "^4.1.5"
+  },
+  "peerDependencies": {
+    "ajv": "^6.10.2"
   }
 }

src/index.js

@@ -1,4 +1,3 @@
-import Ajv from 'ajv'
 import osLocale from 'os-locale'
 import semver from 'semver'
 import schema from '../src/schema'
@@ -104,9 +103,19 @@ export function filter(data, options) {
 
 let ajvValidate
 
-export function validate(data) {
+export async function validate(data) {
   if (!ajvValidate) {
-    ajvValidate = new Ajv().compile(schema)
+    try {
+      const Ajv = await import('ajv').then(m => m.default || m)
+      ajvValidate = new Ajv().compile(schema)
+    } catch (err) {
+      if (err.code === 'MODULE_NOT_FOUND') {
+        console.error('ajv not found, please install the peer dependency') // eslint-disable-line no-console
+        return true
+      }
+
+      throw err
+    }
   }
 
   return ajvValidate(data)

test/motd.test.js

@@ -44,8 +44,8 @@ describe('motd', () => {
     jest.restoreAllMocks()
   })
 
-  test('schema', () => {
-    expect(motd.validate(data)).toBe(true)
+  test('schema', async () => {
+    await expect(motd.validate(data)).resolves.toBe(true)
   })
 
   test('getRegion only returns region part from locale', () => {

test/tags.test.js

@@ -54,8 +54,8 @@ const data = [
 ]
 
 describe('motd', () => {
-  test('schema', () => {
-    expect(motd.validate(data)).toBe(true)
+  test('schema', async () => {
+    await expect(motd.validate(data)).resolves.toBe(true)
   })
 
   test('filterTags doesnt filter without tags specified', () => {