Add strict to tsconfig.json

lib/any.js

@@ -18,18 +18,21 @@ import {test} from './test.js'
 import {root} from './util.js'
 
 var type = zwitch('type', {
+  // @ts-expect-error: hush.
   unknown: unknownType,
   invalid: invalidType,
+  // @ts-expect-error: hush.
   handlers: {selectors, ruleSet, rule}
 })
 
 /**
  * @param {Selectors|RuleSet|Rule} query
- * @param {Node} node
+ * @param {Node|undefined} node
  * @param {SelectState} state
+ * @returns {Array.<Node>}
  */
 export function any(query, node, state) {
-  // @ts-ignore zwitch types are off.
+  // @ts-expect-error: fine.
   return query && node ? type(query, node, state) : []
 }
 
@@ -90,7 +93,7 @@ function rule(query, tree, state) {
   /** @type {SelectIterator} */
   function iterator(query, node, index, parent, state) {
     if (test(query, node, index, parent, state)) {
-      if ('rule' in query) {
+      if (query.rule) {
         nest(query.rule, node, index, parent, configure(query.rule, state))
       } else {
         collect(node)
@@ -136,7 +139,7 @@ function invalidType() {
 }
 
 /**
- * @param {boolean} one
+ * @param {boolean|undefined} one
  */
 function collector(one) {
   /** @type {Array.<Node>} */

lib/attribute.js

@@ -7,13 +7,20 @@
 import {zwitch} from 'zwitch'
 
 var handle = zwitch('operator', {
+  // @ts-expect-error: hush.
   unknown: unknownOperator,
+  // @ts-expect-error: hush.
   invalid: exists,
   handlers: {
+    // @ts-expect-error: hush.
     '=': exact,
+    // @ts-expect-error: hush.
     '^=': begins,
+    // @ts-expect-error: hush.
     '$=': ends,
+    // @ts-expect-error: hush.
     '*=': containsString,
+    // @ts-expect-error: hush.
     '~=': containsArray
   }
 })
@@ -39,6 +46,7 @@ export function attribute(query, node) {
  * @param {Node} node
  */
 function exists(query, node) {
+  // @ts-expect-error: Looks like a record.
   return node[query.name] !== null && node[query.name] !== undefined
 }
 
@@ -49,6 +57,7 @@ function exists(query, node) {
  * @param {Node} node
  */
 function exact(query, node) {
+  // @ts-expect-error: Looks like a record.
   return exists(query, node) && String(node[query.name]) === query.value
 }
 
@@ -59,6 +68,8 @@ function exact(query, node) {
  * @param {Node} node
  */
 function containsArray(query, node) {
+  /** @type {unknown} */
+  // @ts-expect-error: Looks like a record.
   var value = node[query.name]
 
   if (value === null || value === undefined) return false
@@ -82,9 +93,12 @@ function containsArray(query, node) {
  * @param {Node} node
  */
 function begins(query, node) {
+  /** @type {unknown} */
+  // @ts-expect-error: Looks like a record.
   var value = node[query.name]
 
   return (
+    query.value &&
     typeof value === 'string' &&
     value.slice(0, query.value.length) === query.value
   )
@@ -97,9 +111,12 @@ function begins(query, node) {
  * @param {Node} node
  */
 function ends(query, node) {
+  /** @type {unknown} */
+  // @ts-expect-error: Looks like a record.
   var value = node[query.name]
 
   return (
+    query.value &&
     typeof value === 'string' &&
     value.slice(-query.value.length) === query.value
   )
@@ -112,8 +129,10 @@ function ends(query, node) {
  * @param {Node} node
  */
 function containsString(query, node) {
+  /** @type {unknown} */
+  // @ts-expect-error: Looks like a record.
   var value = node[query.name]
-  return typeof value === 'string' && value.includes(query.value)
+  return query.value && typeof value === 'string' && value.includes(query.value)
 }
 
 // Shouldn’t be invoked, Parser throws an error instead.

lib/nest.js

@@ -14,20 +14,24 @@ import {parent} from './util.js'
 var own = {}.hasOwnProperty
 
 var handle = zwitch('nestingOperator', {
+  // @ts-expect-error: hush.
   unknown: unknownNesting,
+  // @ts-expect-error: hush.
   invalid: topScan, // `undefined` is the top query selector.
   handlers: {
+    // @ts-expect-error: hush.
     null: descendant, // `null` is the descendant combinator.
+    // @ts-expect-error: hush.
     '>': child,
+    // @ts-expect-error: hush.
     '+': adjacentSibling,
+    // @ts-expect-error: hush.
     '~': generalSibling
   }
 })
 
 /** @type {Handler} */
-export function nest(query, node, index, parent, state) {
-  return handle(query, node, index, parent, state)
-}
+export const nest = handle
 
 // Shouldn’t be invoked, parser gives correct data.
 /* c8 ignore next 6 */
@@ -41,17 +45,33 @@ function unknownNesting(query) {
 /** @type {Handler} */
 function topScan(query, node, index, parent, state) {
   // Shouldn’t happen.
-  /* c8 ignore next 3 */
+  /* c8 ignore next 7 */
   if (parent) {
     throw new Error('topScan is supposed to be called from the root node')
   }
 
+  if (!state.iterator) {
+    throw new Error('Expected `iterator` to be defined')
+  }
+
+  // Shouldn’t happen.
+  /* c8 ignore next 3 */
+  if (typeof index !== 'number') {
+    throw new TypeError('Expected `index` to be defined')
+  }
+
   state.iterator(query, node, index, parent, state)
   if (!state.shallow) descendant(query, node, index, parent, state)
 }
 
 /** @type {Handler} */
 function descendant(query, node, index, parent, state) {
+  // Shouldn’t happen.
+  /* c8 ignore next 3 */
+  if (!state.iterator) {
+    throw new Error('Expected `iterator` to be defined')
+  }
+
   var previous = state.iterator
 
   state.iterator = iterator
@@ -79,6 +99,12 @@ function child(query, node, _1, _2, state) {
 
 /** @type {Handler} */
 function adjacentSibling(query, _, index, parent, state) {
+  // Shouldn’t happen.
+  /* c8 ignore next 3 */
+  if (typeof index !== 'number') {
+    throw new TypeError('Expected `index` to be defined')
+  }
+
   // Shouldn’t happen.
   /* c8 ignore next */
   if (!parent) return
@@ -92,6 +118,12 @@ function adjacentSibling(query, _, index, parent, state) {
 
 /** @type {Handler} */
 function generalSibling(query, _, index, parent, state) {
+  // Shouldn’t happen.
+  /* c8 ignore next 3 */
+  if (typeof index !== 'number') {
+    throw new TypeError('Expected `index` to be defined')
+  }
+
   // Shouldn’t happen.
   /* c8 ignore next */
   if (!parent) return
@@ -161,6 +193,12 @@ class WalkIterator {
       index = this.typeIndex.index(child)
       this.delayed.push(delay)
     } else {
+      // Shouldn’t happen.
+      /* c8 ignore next 3 */
+      if (!this.state.iterator) {
+        throw new Error('Expected `iterator` to be defined')
+      }
+
       this.state.iterator(this.query, child, start, this.parent, this.state)
     }
 
@@ -173,6 +211,18 @@ class WalkIterator {
      * @this {WalkIterator}
      */
     function delay() {
+      // Shouldn’t happen.
+      /* c8 ignore next 3 */
+      if (!this.typeIndex) {
+        throw new TypeError('Expected `typeIndex` to be defined')
+      }
+
+      // Shouldn’t happen.
+      /* c8 ignore next 3 */
+      if (!this.state.iterator) {
+        throw new Error('Expected `iterator` to be defined')
+      }
+
       this.state.typeIndex = index
       this.state.nodeIndex = nodeIndex
       this.state.typeCount = this.typeIndex.count(child)

lib/parse.js

@@ -12,7 +12,7 @@ import fauxEsmNthCheck from 'nth-check'
 import {zwitch} from 'zwitch'
 
 /** @type {import('nth-check').default} */
-// @ts-ignore
+// @ts-expect-error
 var nthCheck = fauxEsmNthCheck.default
 
 var nth = new Set([
@@ -28,6 +28,7 @@ parser.registerAttrEqualityMods('~', '^', '$', '*')
 parser.registerSelectorPseudos('any', 'matches', 'not', 'has')
 parser.registerNestingOperators('>', '+', '~')
 
+// @ts-expect-error: hush.
 var compile = zwitch('type', {handlers: {selectors, ruleSet, rule}})
 
 /**
@@ -39,7 +40,7 @@ export function parse(selector) {
     throw new TypeError('Expected `string` as selector, not `' + selector + '`')
   }
 
-  // @ts-ignore types are wrong.
+  // @ts-expect-error types are wrong.
   return compile(parser.parse(selector))
 }
 
@@ -77,9 +78,9 @@ function rule(query) {
     pseudo = pseudos[index]
 
     if (nth.has(pseudo.name)) {
-      // @ts-ignore Patch a non-primitive type.
+      // @ts-expect-error Patch a non-primitive type.
       pseudo.value = nthCheck(pseudo.value)
-      // @ts-ignore Patch a non-primitive type.
+      // @ts-expect-error Patch a non-primitive type.
       pseudo.valueType = 'function'
     }
   }