refactor: improve schema (#257)

Author: evilebottnawi

src/options.json

@@ -8,7 +8,9 @@
           "type": "array",
           "items": {
             "type": "string"
-          }
+          },
+          "minItems": 1,
+          "uniqueItems": true
         },
         {
           "type": "object",
@@ -17,7 +19,9 @@
               "type": "array",
               "items": {
                 "type": "string"
-              }
+              },
+              "minItems": 1,
+              "uniqueItems": true
             },
             "filter": {
               "instanceof": "Function"

test/__snapshots__/validate-options.test.js.snap

@@ -1,15 +1,45 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`validate options should throw an error on the "attributes" option with "[":src",":src"]" value 1`] = `
+"Invalid options object. HTML Loader has been initialized using an options object that does not match the API schema.
+ - options.attributes should not contain the item ':src' twice."
+`;
+
+exports[`validate options should throw an error on the "attributes" option with "[]" value 1`] = `
+"Invalid options object. HTML Loader has been initialized using an options object that does not match the API schema.
+ - options.attributes should be an non-empty array."
+`;
+
+exports[`validate options should throw an error on the "attributes" option with "{"filter":false}" value 1`] = `
+"Invalid options object. HTML Loader has been initialized using an options object that does not match the API schema.
+ - options.attributes.filter should be an instance of function."
+`;
+
+exports[`validate options should throw an error on the "attributes" option with "{"list":[":src",":src"]}" value 1`] = `
+"Invalid options object. HTML Loader has been initialized using an options object that does not match the API schema.
+ - options.attributes.list should not contain the item ':src' twice."
+`;
+
+exports[`validate options should throw an error on the "attributes" option with "{"list":[]}" value 1`] = `
+"Invalid options object. HTML Loader has been initialized using an options object that does not match the API schema.
+ - options.attributes.list should be an non-empty array."
+`;
+
+exports[`validate options should throw an error on the "attributes" option with "{"root":false}" value 1`] = `
+"Invalid options object. HTML Loader has been initialized using an options object that does not match the API schema.
+ - options.attributes.root should be a string."
+`;
+
 exports[`validate options should throw an error on the "attributes" option with "true" value 1`] = `
 "Invalid options object. HTML Loader has been initialized using an options object that does not match the API schema.
  - options.attributes should be one of these:
-   boolean | [string, ...] | object { root?, list? }
+   boolean | [string, ...] (should not have fewer than 1 item, should not have duplicate items) | object { list?, filter?, root? }
    Details:
     * options.attributes should be a boolean.
     * options.attributes should be an array:
-      [string, ...]
+      [string, ...] (should not have fewer than 1 item, should not have duplicate items)
     * options.attributes should be an object:
-      object { root?, list? }"
+      object { list?, filter?, root? }"
 `;
 
 exports[`validate options should throw an error on the "esModule" option with "true" value 1`] = `

test/validate-options.test.js

@@ -6,7 +6,6 @@ describe('validate options', () => {
       success: [
         true,
         false,
-        [],
         ['img:src'],
         ['img:src', ':srcset'],
         { root: '.' },
@@ -16,7 +15,15 @@ describe('validate options', () => {
         { list: ['img:src'], root: '.' },
         { list: ['img:src'], root: '.', filter: () => true },
       ],
-      failure: ['true'],
+      failure: [
+        'true',
+        [],
+        [':src', ':src'],
+        { list: [] },
+        { list: [':src', ':src'] },
+        { filter: false },
+        { root: false },
+      ],
     },
     esModule: {
       success: [true, false],