Ensure backwards compatibility of palantir#2036 (palantir#2055)

This commit can be reverted once tslint drops support for typescript 2.0.10

Fixes palantir#2054

docs/_data/rules.json

@@ -1744,7 +1744,7 @@
     "ruleName": "whitespace",
     "description": "Enforces whitespace style conventions.",
     "rationale": "Helps maintain a readable, consistent style in your codebase.",
-    "optionsDescription": "\nSeven arguments may be optionally provided:\n\n* `\"check-branch\"` checks branching statements (`if`/`else`/`for`/`while`) are followed by whitespace.\n* `\"check-decl\"`checks that variable declarations have whitespace around the equals token.\n* `\"check-operator\"` checks for whitespace around operator tokens.\n* `\"check-module\"` checks for whitespace in import & export statements.\n* `\"check-separator\"` checks for whitespace after separator tokens (`,`/`;`).\n* `\"check-type\"` checks for whitespace before a variable type specification.\n* `\"check-typecast\"` checks for whitespace between a typecast and its target.\n* `\"check-preblock\"` checks for whitespace before the opening brace of a block",
+    "optionsDescription": "\nEight arguments may be optionally provided:\n\n* `\"check-branch\"` checks branching statements (`if`/`else`/`for`/`while`) are followed by whitespace.\n* `\"check-decl\"`checks that variable declarations have whitespace around the equals token.\n* `\"check-operator\"` checks for whitespace around operator tokens.\n* `\"check-module\"` checks for whitespace in import & export statements.\n* `\"check-separator\"` checks for whitespace after separator tokens (`,`/`;`).\n* `\"check-type\"` checks for whitespace before a variable type specification.\n* `\"check-typecast\"` checks for whitespace between a typecast and its target.\n* `\"check-preblock\"` checks for whitespace before the opening brace of a block",
     "options": {
       "type": "array",
       "items": {

docs/rules/whitespace/index.html

@@ -4,7 +4,7 @@
 rationale: 'Helps maintain a readable, consistent style in your codebase.'
 optionsDescription: |-
 
-  Seven arguments may be optionally provided:
+  Eight arguments may be optionally provided:
 
   * `"check-branch"` checks branching statements (`if`/`else`/`for`/`while`) are followed by whitespace.
   * `"check-decl"`checks that variable declarations have whitespace around the equals token.

src/language/utils.ts

@@ -281,7 +281,10 @@ export function forEachToken(node: ts.Node, skipTrivia: boolean, cb: ForEachToke
     }
 
     function iterateChildren(child: ts.Node): void {
-        if (child.kind < ts.SyntaxKind.FirstNode) {
+        if (child.kind < ts.SyntaxKind.FirstNode ||
+            // for backwards compatibility to typescript 2.0.10
+            // JsxText was no Token, but a Node in that version
+            child.kind === ts.SyntaxKind.JsxText) {
             // we found a token, tokens have no children, stop recursing here
             return callback(child);
         }
@@ -341,13 +344,20 @@ export function forEachComment(node: ts.Node, cb: ForEachCommentCallback) {
         // don't search for comments inside JsxText
         if (canHaveLeadingTrivia(tokenKind, parent)) {
             // Comments before the first token (pos.fullStart === 0) are all considered leading comments, so no need for special treatment
-            ts.forEachLeadingCommentRange(fullText, pos.fullStart, commentCallback);
+            const comments = ts.getLeadingCommentRanges(fullText, pos.fullStart);
+            if (comments !== undefined) {
+                for (const comment of comments) {
+                    cb(fullText, comment.kind, {fullStart: pos.fullStart, tokenStart: comment.pos, end: comment.end});
+                }
+            }
         }
         if (canHaveTrailingTrivia(tokenKind, parent)) {
-            ts.forEachTrailingCommentRange(fullText, pos.end, commentCallback);
-        }
-        function commentCallback(tokenStart: number, end: number, kind: ts.SyntaxKind) {
-            cb(fullText, kind, {tokenStart, end, fullStart: pos.fullStart});
+            const comments = ts.getTrailingCommentRanges(fullText, pos.end);
+            if (comments !== undefined) {
+                for (const comment of comments) {
+                    cb(fullText, comment.kind, {fullStart: pos.fullStart, tokenStart: comment.pos, end: comment.end});
+                }
+            }
         }
     });
 }
@@ -402,8 +412,6 @@ function canHaveTrailingTrivia(tokenKind: ts.SyntaxKind, parent: ts.Node): boole
  *                 This value is typically obtained from `node.getFullStart()` or `node.getEnd()`
  */
 export function hasCommentAfterPosition(text: string, position: number): boolean {
-    const cb = () => true;
-    return ts.forEachTrailingCommentRange(text, position, cb) ||
-           ts.forEachLeadingCommentRange(text, position, cb) ||
-           false; // return boolean instead of undefined if no comment is found
+    return ts.getTrailingCommentRanges(text, position) !== undefined ||
+           ts.getTrailingCommentRanges(text, position) !== undefined;
 }