Fix: ESLint 4.x compat (handle shebangs and no deprecated APIs)

eslint-plugin-prettier.js

@@ -108,7 +108,7 @@ function reportDifferences(context, prettierSource) {
   // and another's beginning does not have line endings (i.e. issues that occur
   // on contiguous lines).
 
-  const source = context.getSource();
+  const source = context.getSourceCode().text;
   const results = diff(source, prettierSource);
 
   const batch = [];
@@ -271,14 +271,22 @@ module.exports.rules = {
         ? context.options[1].slice(1) // Remove leading @
         : null;
 
+      const sourceCode = context.getSourceCode();
+      const source = sourceCode.text;
+
+      // The pragma is only valid if it is found in a block comment at the very
+      // start of the file.
       if (pragma) {
-        // The pragma is only valid if it is found in a block comment at the
-        // very start of the file.
-        const firstComment = context.getAllComments()[0];
+        // ESLint 3.x reports the shebang as a "Line" node, while ESLint 4.x
+        // reports it as a "Shebang" node. This works for both versions:
+        const hasShebang = source.startsWith('#!');
+        const allComments = sourceCode.getAllComments();
+        const firstComment = hasShebang ? allComments[1] : allComments[0];
         if (
           !(firstComment &&
             firstComment.type === 'Block' &&
-            firstComment.start === 0)
+            firstComment.loc.start.line === (hasShebang ? 2 : 1) &&
+            firstComment.loc.start.column === 0)
         ) {
           return {};
         }
@@ -294,7 +302,6 @@ module.exports.rules = {
             // Prettier is expensive to load, so only load it if needed.
             prettier = require('prettier');
           }
-          const source = context.getSource();
           const prettierSource = prettier.format(source, prettierOptions);
           if (source !== prettierSource) {
             reportDifferences(context, prettierSource);

test/invalid/19.txt

@@ -0,0 +1,20 @@
+CODE:
+#!/usr/bin/env node
+/** @format */
+var foo = '';
+
+OUTPUT:
+#!/usr/bin/env node
+/** @format */
+var foo = "";
+
+OPTIONS:
+[null, '@format']
+
+ERRORS:
+[
+  {
+    message: 'Replace `\'\'` with `""`',
+    line: 3, column: 11, endLine: 3, endColumn: 13,
+  },
+]

test/prettier.js

@@ -35,7 +35,9 @@ ruleTester.run('prettier', rule, {
     // Facebook style but missing pragma.
     { code: `"";\n`, options: ['fb', '@format'] },
     // Facebook style with pragma.
-    { code: `/** @format */\n'';\n`, options: ['fb', '@format'] }
+    { code: `/** @format */\n'';\n`, options: ['fb', '@format'] },
+    // Shebang with pragma.
+    { code: `#!/bin/node\n/** @format */\n"";\n`, options: [null, '@format'] }
   ],
   invalid: [
     '01',
@@ -57,7 +59,8 @@ ruleTester.run('prettier', rule, {
     '15',
     '16',
     '17',
-    '18'
+    '18',
+    '19'
   ].map(loadInvalidFixture)
 });