feat(eslint-plugin): add prefer-string-starts-ends-with rule (fixes #285

)

packages/eslint-plugin/docs/rules/prefer-string-starts-ends-with.md

@@ -0,0 +1,54 @@
+# Enforce to use `String#startsWith` and `String#endsWith` over other options (prefer-string-starts-ends-with)
+
+There are multiple ways to verify if a string starts or ends with a specific string, auch as `foo.indexOf('bar') === 0`.
+
+Since ES2015 has added `String#startsWith` and `String#endsWith`, this rule reports other ways to be consistent.
+
+## Rule Details
+
+This rule is aimed at enforcing the consistent way that checks a string starts or ends with a specific string.
+
+Examples of **incorrect** code for this rule:
+
+```ts
+let foo: string
+
+// starts with
+foo[0] === 'b'
+foo.charAt(0) === 'b'
+foo.indexOf('bar') === 0
+foo.slice(0, 3) === 'bar'
+foo.substring(0, 3) === 'bar'
+foo.match(/^bar/)
+/^bar/.test(foo)
+
+// ends with
+foo[foo.length - 1] === 'b'
+foo.charAt(foo.length - 1) === 'b'
+foo.lastIndexOf('bar') === foo.length - 3
+foo.slice(-3) === 'bar'
+foo.substring(foo.length - 3) === 'bar'
+foo.match(/bar$/)
+/bar$/.test(foo)
+```
+
+Examples of **correct** code for this rule:
+
+```ts
+foo.startsWith('bar');
+foo.endsWith('bar');
+```
+
+## Options
+
+There is no option.
+
+```JSON
+{
+    "@typescript-eslint/prefer-string-starts-ends-with": "error"
+}
+```
+
+## When Not To Use It
+
+If you don't mind that style, you can turn this rule off safely.

packages/eslint-plugin/package.json

@@ -37,6 +37,8 @@
   "dependencies": {
     "@typescript-eslint/parser": "1.3.0",
     "@typescript-eslint/typescript-estree": "1.3.0",
+    "eslint-utils": "^1.3.1",
+    "regexpp": "^2.0.1",
     "requireindex": "^1.2.0",
     "tsutils": "^3.7.0"
   },