MAINT Replace var ==> let and added semicolons (#979)

docs/js-api/pyodide_pyimport.md

@@ -5,7 +5,7 @@ Access a Python object in the global namespace from Javascript.
 
 For example, to access the `foo` Python object from Javascript:
 ```javascript
-var foo = pyodide.pyimport('foo')
+let foo = pyodide.pyimport('foo');
 ```
 
 *Parameters*

docs/type_conversions.md

@@ -36,7 +36,7 @@ access arrays on the Javascript heap), and the data type is preserved. This
 makes it easy to correctly convert it to a Numpy array using `numpy.asarray`:
 
 ```javascript
-array = Float32Array([1, 2, 3])
+let array = Float32Array([1, 2, 3]);
 ```
 
 ```python
@@ -112,7 +112,7 @@ Therefore, custom Python objects must be manually destroyed when passed to Javas
 they will leak. To do this, call `.destroy()` on the object, after which Javascript will no longer have access to the object.
 
 ```javascript
-var foo = pyodide.pyimport('foo');
+let foo = pyodide.pyimport('foo');
 foo.call_method();
 foo.destroy();
 foo.call_method(); // This will raise an exception, since the object has been
@@ -127,7 +127,7 @@ giving the name of the variable, and returns the object, converted to
 Javascript.
 
 ```javascript
-var sys = pyodide.pyimport('sys');
+let sys = pyodide.pyimport('sys');
 ```
 (type_conversions_using_js_obj_from_py)=
 ## Using Javascript objects from Python
@@ -152,7 +152,7 @@ Python, you may want to store it in a Python variable or use the `from js import
 For example, given this large Javascript variable:
 
 ```javascript
-var x = new Array(1000).fill(0)
+let x = new Array(1000).fill(0);
 ```
 
 Use it from Python as follows:

docs/using_pyodide_from_webworker.md

@@ -114,7 +114,7 @@ async function loadPythonPackages(){
     pythonLoading = self.pyodide.loadPackage(['numpy', 'pytz']);
 }
 
-var onmessage = async(event) => {
+let onmessage = async(event) => {
     await languagePluginLoader;
      // since loading package is asynchronous, we need to make sure loading is done:
     await pythonLoading;

src/pyodide.js

@@ -2,11 +2,11 @@
  * The main bootstrap script for loading pyodide.
  */
 
-var languagePluginLoader = new Promise((resolve, reject) => {
+globalThis.languagePluginLoader = new Promise((resolve, reject) => {
   // Note: PYODIDE_BASE_URL is an environement variable replaced in
   // in this template in the Makefile. It's recommended to always set
   // languagePluginUrl in any case.
-  var baseURL = self.languagePluginUrl || '{{ PYODIDE_BASE_URL }}';
+  let baseURL = self.languagePluginUrl || '{{ PYODIDE_BASE_URL }}';
   baseURL = baseURL.substr(0, baseURL.lastIndexOf('/')) + '/';
 
   ////////////////////////////////////////////////////////////
@@ -316,7 +316,7 @@ var languagePluginLoader = new Promise((resolve, reject) => {
   ];
 
   function makePublicAPI(module, public_api) {
-    var namespace = {_module : module};
+    let namespace = {_module : module};
     for (let name of public_api) {
       namespace[name] = module[name];
     }

src/templates/console.html

@@ -19,7 +19,7 @@
           handleResult(c.push(line))
         }
 
-        var term = $('body').terminal(
+        let term = $('body').terminal(
           pushCode,
           {
             greetings: "Welcome to the Pyodide terminal emulator 🐍",
@@ -40,20 +40,20 @@
           _c = Console(locals=globals())
         `)
 
-        var c = pyodide.pyimport('_c')
+        let c = pyodide.pyimport('_c');
 
         function handleResult(result) {
           if (result) {
-            term.set_prompt('[[;gray;]... ]')
+            term.set_prompt('[[;gray;]... ]');
           } else {
-            term.set_prompt('[[;red;]>>> ]')
-            var stderr = pyodide.runPython("sys.stderr.getvalue()").trim()
+            term.set_prompt('[[;red;]>>> ]');
+            let stderr = pyodide.runPython("sys.stderr.getvalue()").trim();
             if (stderr) {
-              term.echo(`[[;red;]${stderr}]`)
+              term.echo(`[[;red;]${stderr}]`);
             } else {
-              var stdout = pyodide.runPython("sys.stdout.getvalue()")
+              let stdout = pyodide.runPython("sys.stdout.getvalue()");
               if (stdout) {
-                term.echo(stdout.trim())
+                term.echo(stdout.trim());
               }
             }
           }
@@ -62,22 +62,22 @@
         term.runPython = function(code) {
           pyodide.runPythonAsync(code).then(
             term.handlePythonResult, term.handlePythonError
-          )
-        }
+          );
+        };
 
         term.handlePythonResult = function(result) {
           if (result === undefined) {
-            return
+            return;
           } else if (result['_repr_html_'] !== undefined) {
-            term.echo(result['_repr_html_'], {raw: true})
+            term.echo(result['_repr_html_'], {raw: true});
           } else {
-            term.echo(result.toString())
+            term.echo(result.toString());
           }
-        }
+        };
 
         term.handlePythonError = function(result) {
-          term.error(result.toString())
-        }
+          term.error(result.toString());
+        };
       });
     </script>
   </body>

src/tests/test_jsproxy.py

@@ -143,7 +143,7 @@ def test_jsproxy_iter(selenium):
     selenium.run_js(
         """
         function makeIterator(array) {
-          var nextIndex = 0;
+          let nextIndex = 0;
           return {
             next: function() {
               return nextIndex < array.length ?

src/tests/test_python.py

@@ -75,7 +75,7 @@ def test_load_package_after_convert_string(selenium):
     See #93.
     """
     selenium.run("import sys\n" "x = sys.version")
-    selenium.run_js("var x = pyodide.pyimport('x')\n" "console.log(x)")
+    selenium.run_js("let x = pyodide.pyimport('x');\n" "console.log(x);")
     selenium.load_package("kiwisolver")
     selenium.run("import kiwisolver")
 

src/tests/test_typeconversions.py

@@ -170,7 +170,7 @@ def test_typed_arrays(selenium, wasm_heap, jstype, pytype):
     else:
         selenium.run_js(
             f"""
-             var buffer = pyodide._module._malloc(
+             let buffer = pyodide._module._malloc(
                    4 * {jstype}.BYTES_PER_ELEMENT);
              window.array = new {jstype}(
                    pyodide._module.HEAPU8.buffer, buffer, 4);
@@ -210,7 +210,7 @@ def test_array_buffer(selenium):
 def assert_js_to_py_to_js(selenium, name):
     selenium.run_js(f"window.obj = {name};")
     selenium.run("from js import obj")
-    assert selenium.run_js("return pyodide.globals['obj'] === obj")
+    assert selenium.run_js("return pyodide.globals['obj'] === obj;")
 
 
 def assert_py_to_js_to_py(selenium, name):
@@ -230,7 +230,7 @@ def test_recursive_list_to_js(selenium_standalone):
         x.append(x)
         """
     )
-    selenium_standalone.run_js("x = pyodide.pyimport('x')")
+    selenium_standalone.run_js("x = pyodide.pyimport('x');")
 
 
 def test_recursive_dict_to_js(selenium_standalone):
@@ -240,7 +240,7 @@ def test_recursive_dict_to_js(selenium_standalone):
         x[0] = x
         """
     )
-    selenium_standalone.run_js("x = pyodide.pyimport('x')")
+    selenium_standalone.run_js("x = pyodide.pyimport('x');")
 
 
 def test_list_from_js(selenium):
@@ -272,7 +272,7 @@ def test_jsproxy_attribute_error(selenium):
                 this.y = y;
             }
         }
-        window.point = new Point(42, 43)
+        window.point = new Point(42, 43);
         """
     )
     selenium.run(
@@ -309,7 +309,7 @@ def test_javascript_error(selenium):
 def test_javascript_error_back_to_js(selenium):
     selenium.run_js(
         """
-        window.err = new Error("This is a js error")
+        window.err = new Error("This is a js error");
         """
     )
     assert (
@@ -324,7 +324,7 @@ def test_javascript_error_back_to_js(selenium):
     )
     assert selenium.run_js(
         """
-        return pyodide.globals["py_err"] === err
+        return pyodide.globals["py_err"] === err;
         """
     )