diff --git a/document/js-api/index.bs b/document/js-api/index.bs
index 26f4665706..72b09d07fc 100644
--- a/document/js-api/index.bs
+++ b/document/js-api/index.bs
@@ -1933,7 +1933,7 @@ The <dfn abstract-op lt="CharCodeAt ">CharCodeAt(|string|, |index|)</dfn> abstra
 
 <h4 id="js-string-cast">cast</h4>
 
-The |funcType| of this builtin is `(func (param externref) (result externref))`.
+The |funcType| of this builtin is `(rec (type (func (param externref) (result externref)))).0`.
 
 <div algorithm="js-string-cast">
 When this builtin is invoked with parameter |v|, the following steps must be run:
@@ -1944,7 +1944,7 @@ When this builtin is invoked with parameter |v|, the following steps must be run
 
 <h4 id="js-string-test">test</h4>
 
-The |funcType| of this builtin is `(func (param externref) (result i32))`.
+The |funcType| of this builtin is `(rec (type (func (param externref) (result i32)))).0`.
 
 <div algorithm="js-string-test">
 When this builtin is invoked with parameter |v|, the following steps must be run:
@@ -1957,9 +1957,9 @@ When this builtin is invoked with parameter |v|, the following steps must be run
 
 <h4 id="js-string-fromCharCodeArray">fromCharCodeArray</h4>
 
-The |funcType| of this builtin is `(func (param (ref null (array (mut i16))) i32 i32) (result externref))`.
+Let |arrayType| be `(rec (type (array (mut i16)))).0`.
 
-Note: This function only takes a mutable i16 array defined in its own recursion group.
+The |funcType| of this builtin is `(rec (type (func (param (ref null arrayType) i32 i32) (result externref)))).0`.
 
 <div algorithm="js-string-fromCharCodeArray">
 When this builtin is invoked with parameters |array|, |start|, and |end|, the following steps must be run:
@@ -1982,9 +1982,9 @@ When this builtin is invoked with parameters |array|, |start|, and |end|, the fo
 
 <h4 id="js-string-intoCharCodeArray">intoCharCodeArray</h4>
 
-The |funcType| of this builtin is `(func (param externref (ref null (array (mut i16))) i32) (result i32))`.
+Let |arrayType| be `(rec (type (array (mut i16)))).0`.
 
-Note: This function only takes a mutable i16 array defined in its own recursion group.
+The |funcType| of this builtin is `(rec (type (func (param externref (ref null arrayType) i32) (result i32)))).0`.
 
 <div algorithm="js-string-intoCharCodeArray">
 When this builtin is invoked with parameters |string|, |array|, and |start|, the following steps must be run:
@@ -2008,7 +2008,7 @@ When this builtin is invoked with parameters |string|, |array|, and |start|, the
 
 <h4 id="js-string-fromCharCode">fromCharCode</h4>
 
-The |funcType| of this builtin is `(func (param i32) (result externref))`.
+The |funcType| of this builtin is `(rec (type (func (param i32) (result externref)))).0`.
 
 <div algorithm="js-string-fromCharCode">
 When this builtin is invoked with parameter |v|, the following steps must be run:
@@ -2019,7 +2019,7 @@ When this builtin is invoked with parameter |v|, the following steps must be run
 
 <h4 id="js-string-fromCodePoint">fromCodePoint</h4>
 
-The |funcType| of this builtin is `(func (param i32) (result externref))`.
+The |funcType| of this builtin is `(rec (type (func (param i32) (result externref)))).0`.
 
 <div algorithm="js-string-fromCodePoint">
 When this builtin is invoked with parameter |v|, the following steps must be run:
@@ -2032,7 +2032,7 @@ When this builtin is invoked with parameter |v|, the following steps must be run
 
 <h4 id="js-string-charCodeAt">charCodeAt</h4>
 
-The type of this function is `(func (param externref i32) (result i32))`.
+The type of this function is `(rec (type (func (param externref i32) (result i32)))).0`.
 
 <div algorithm="js-string-charCodeAt">
 When this builtin is invoked with parameters |string| and |index|, the following steps must be run:
@@ -2047,7 +2047,7 @@ When this builtin is invoked with parameters |string| and |index|, the following
 
 <h4 id="js-string-codePointAt">codePointAt</h4>
 
-The type of this function is `(func (param externref i32) (result i32))`.
+The type of this function is `(rec (type (func (param externref i32) (result i32)))).0`.
 
 <div algorithm="js-string-codePointAt">
 When this builtin is invoked with parameters |string| and |index|, the following steps must be run:
@@ -2062,7 +2062,7 @@ When this builtin is invoked with parameters |string| and |index|, the following
 
 <h4 id="js-string-length">length</h4>
 
-The |funcType| of this builtin is `(func (param externref) (result i32))`.
+The |funcType| of this builtin is `(rec (type (func (param externref) (result i32)))).0`.
 
 <div algorithm="js-string-length">
 When this builtin is invoked with parameter |v|, the following steps must be run:
@@ -2074,7 +2074,7 @@ When this builtin is invoked with parameter |v|, the following steps must be run
 
 <h4 id="js-string-concat">concat</h4>
 
-The |funcType| of this builtin is `(func (param externref externref) (result externref))`.
+The |funcType| of this builtin is `(rec (type (func (param externref externref) (result externref)))).0`.
 
 <div algorithm="js-string-concat">
 When this builtin is invoked with parameters |first| and |second|, the following steps must be run:
@@ -2087,7 +2087,7 @@ When this builtin is invoked with parameters |first| and |second|, the following
 
 <h4 id="js-string-substring">substring</h4>
 
-The |funcType| of this builtin is `(func (param externref i32 i32) (result externref))`.
+The |funcType| of this builtin is `(rec (type (func (param externref i32 i32) (result externref)))).0`.
 
 <div algorithm="js-string-substring">
 When this builtin is invoked with parameters |string|, |start|, and |end|, the following steps must be run:
@@ -2102,7 +2102,7 @@ When this builtin is invoked with parameters |string|, |start|, and |end|, the f
 
 <h4 id="js-string-equals">equals</h4>
 
-The |funcType| of this builtin is `(func (param externref externref) (result i32))`.
+The |funcType| of this builtin is `(rec (type (func (param externref externref) (result i32)))).0`.
 
 Note: Explicitly allow null strings to be compared for equality as that is meaningful.
 
@@ -2122,7 +2122,7 @@ When this builtin is invoked with parameters |first| and |second|, the following
 
 <h4 id="js-string-compare">compare</h4>
 
-The |funcType| of this builtin is `(func (param externref externref) (result i32))`.
+The |funcType| of this builtin is `(rec (type (func (param externref externref) (result i32)))).0`.
 
 <div algorithm="js-string-compare">