[Fix] no-relative-parent-imports: support TypeScript

Fixes import-js#1130

CHANGELOG.md

@@ -12,6 +12,7 @@ This change log adheres to standards from [Keep a CHANGELOG](http://keepachangel
 - [`extensions`]/importType: Fix @/abc being treated as scoped module ([#1854], thanks [@3nuc])
 - allow using rest operator in named export ([#1878], thanks [@foray1010])
 - [`dynamic-import-chunkname`]: allow single quotes to match Webpack support ([#1848], thanks [@straub])
+- [`no-relative-parent-imports`]: check unresolved dependency type ([#1130], thanks [@bogdanb])
 
 ### Changed
 - [`export`]: add tests for a name collision with `export * from` ([#1704], thanks @tomprats)
@@ -719,6 +720,7 @@ for info on changes for earlier releases.
 [`no-named-export`]: ./docs/rules/no-named-export.md
 [`no-namespace`]: ./docs/rules/no-namespace.md
 [`no-nodejs-modules`]: ./docs/rules/no-nodejs-modules.md
+[`no-relative-parent-imports`]: ./docs/rules/no-relative-parent-imports.md
 [`no-restricted-paths`]: ./docs/rules/no-restricted-paths.md
 [`no-self-import`]: ./docs/rules/no-self-import.md
 [`no-unassigned-import`]: ./docs/rules/no-unassigned-import.md
@@ -732,6 +734,7 @@ for info on changes for earlier releases.
 
 [`memo-parser`]: ./memo-parser/README.md
 
+[#1130]: https://github.com/benmosher/eslint-plugin-import/issues/1130
 [#1878]: https://github.com/benmosher/eslint-plugin-import/pull/1878
 [#1854]: https://github.com/benmosher/eslint-plugin-import/issues/1854
 [#1848]: https://github.com/benmosher/eslint-plugin-import/pull/1848
@@ -1276,3 +1279,4 @@ for info on changes for earlier releases.
 [@foray1010]: https://github.com/foray1010
 [@tomprats]: https://github.com/tomprats
 [@straub]: https://github.com/straub
+[@bogdanb]: https://github.com/bogdanb

src/rules/no-relative-parent-imports.js

@@ -18,13 +18,7 @@ module.exports = {
     const myPath = context.getFilename()
     if (myPath === '<text>') return {} // can't check a non-file
 
-    function checkSourceValue(sourceNode) {
-      const depPath = sourceNode.value
-
-      if (importType(depPath, context) === 'external') { // ignore packages
-        return
-      }
-
+    function resolvedImportType(depPath) {
       const absDepPath = resolve(depPath, context)
 
       if (!absDepPath) { // unable to resolve path
@@ -33,7 +27,18 @@ module.exports = {
 
       const relDepPath = relative(dirname(myPath), absDepPath)
 
-      if (importType(relDepPath, context) === 'parent') {
+      return importType(relDepPath, context)
+    }
+
+    function checkSourceValue(sourceNode) {
+      const depPath = sourceNode.value
+      const depType = importType(depPath, context)
+
+      if (depType === 'external') { // ignore packages
+        return
+      }
+
+      if (depType === 'parent' || resolvedImportType(depPath) === 'parent') {
         context.report({
           node: sourceNode,
           message: 'Relative imports from parent directories are not allowed. ' +