Add strict to tsconfig.json

Author: wooorm

index.js

@@ -8,7 +8,7 @@
  * Stringify one point, a position (start and end points), or a node’s
  * positional information.
  *
- * @param {NodeLike|Position|Point} [value]
+ * @param {NodeLike|Position|Point|null} [value]
  * @returns {string}
  */
 export function stringifyPosition(value) {
@@ -37,23 +37,23 @@ export function stringifyPosition(value) {
 }
 
 /**
- * @param {Point} point
+ * @param {Point|undefined} point
  * @returns {string}
  */
 function point(point) {
   return index(point && point.line) + ':' + index(point && point.column)
 }
 
 /**
- * @param {Position} pos
+ * @param {Position|undefined} pos
  * @returns {string}
  */
 function position(pos) {
   return point(pos && pos.start) + '-' + point(pos && pos.end)
 }
 
 /**
- * @param {number} value
+ * @param {number|undefined} value
  * @returns {number}
  */
 function index(value) {

test.js

@@ -58,7 +58,9 @@ test('stringifyPosition', function (t) {
     stringifyPosition({
       type: 'text',
       position: {
+        // @ts-expect-error runtime.
         start: {line: null, column: null},
+        // @ts-expect-error runtime.
         end: {line: null, column: null}
       }
     }),
@@ -79,6 +81,7 @@ test('stringifyPosition', function (t) {
   )
 
   t.equal(
+    // @ts-expect-error runtime.
     stringifyPosition({start: null, end: null}),
     '1:1-1:1',
     'should return a range for a `position` without `point`s'
@@ -99,6 +102,7 @@ test('stringifyPosition', function (t) {
   )
 
   t.equal(
+    // @ts-expect-error runtime.
     stringifyPosition({
       start: {line: null, column: null},
       end: {line: null, column: null}
@@ -117,6 +121,7 @@ test('stringifyPosition', function (t) {
   )
 
   t.equal(
+    // @ts-expect-error runtime.
     stringifyPosition({line: null, column: null}),
     '1:1',
     'should return a point for a `point` without indices'

tsconfig.json

@@ -10,6 +10,7 @@
     "declaration": true,
     "emitDeclarationOnly": true,
     "allowSyntheticDefaultImports": true,
-    "skipLibCheck": true
+    "skipLibCheck": true,
+    "strict": true
   }
 }