mirror of https://github.com/vector-im/riot-web
link to code style document, instead of having local copy
Bruno Windels
parent
5934bebafb
commit
c693d861f4
|
|
@ -45,3 +45,12 @@ puppeteer.launch({headless: false});
|
|||
Run tests with `sh run.sh`.
|
||||
|
||||
You should see the terminal split with on top the server output (both riot static server, and synapse), and on the bottom the tests running.
|
||||
|
||||
Developer Guide
|
||||
===============
|
||||
|
||||
Please follow the standard Matrix contributor's guide:
|
||||
https://github.com/matrix-org/synapse/tree/master/CONTRIBUTING.rst
|
||||
|
||||
Please follow the Matrix JS/React code style as per:
|
||||
https://github.com/matrix-org/matrix-react-sdk/blob/master/code_style.md
|
||||
|
|
|
|||
184
code_style.md
184
code_style.md
|
|
@ -1,184 +0,0 @@
|
|||
Matrix JavaScript/ECMAScript Style Guide
|
||||
========================================
|
||||
|
||||
The intention of this guide is to make Matrix's JavaScript codebase clean,
|
||||
consistent with other popular JavaScript styles and consistent with the rest of
|
||||
the Matrix codebase. For reference, the Matrix Python style guide can be found
|
||||
at https://github.com/matrix-org/synapse/blob/master/docs/code_style.rst
|
||||
|
||||
This document reflects how we would like Matrix JavaScript code to look, with
|
||||
acknowledgement that a significant amount of code is written to older
|
||||
standards.
|
||||
|
||||
Write applications in modern ECMAScript and use a transpiler where necessary to
|
||||
target older platforms. When writing library code, consider carefully whether
|
||||
to write in ES5 to allow all JavaScript application to use the code directly or
|
||||
writing in modern ECMAScript and using a transpile step to generate the file
|
||||
that applications can then include. There are significant benefits in being
|
||||
able to use modern ECMAScript, although the tooling for doing so can be awkward
|
||||
for library code, especially with regard to translating source maps and line
|
||||
number throgh from the original code to the final application.
|
||||
|
||||
General Style
|
||||
-------------
|
||||
- 4 spaces to indent, for consistency with Matrix Python.
|
||||
- 120 columns per line, but try to keep JavaScript code around the 80 column mark.
|
||||
Inline JSX in particular can be nicer with more columns per line.
|
||||
- No trailing whitespace at end of lines.
|
||||
- Don't indent empty lines.
|
||||
- One newline at the end of the file.
|
||||
- Unix newlines, never `\r`
|
||||
- Indent similar to our python code: break up long lines at logical boundaries,
|
||||
more than one argument on a line is OK
|
||||
- Use semicolons, for consistency with node.
|
||||
- UpperCamelCase for class and type names
|
||||
- lowerCamelCase for functions and variables.
|
||||
- Single line ternary operators are fine.
|
||||
- UPPER_CAMEL_CASE for constants
|
||||
- Single quotes for strings by default, for consistency with most JavaScript styles:
|
||||
|
||||
```javascript
|
||||
"bad" // Bad
|
||||
'good' // Good
|
||||
```
|
||||
- Use parentheses or `` ` `` instead of `\` for line continuation where ever possible
|
||||
- Open braces on the same line (consistent with Node):
|
||||
|
||||
```javascript
|
||||
if (x) {
|
||||
console.log("I am a fish"); // Good
|
||||
}
|
||||
|
||||
if (x)
|
||||
{
|
||||
console.log("I am a fish"); // Bad
|
||||
}
|
||||
```
|
||||
- Spaces after `if`, `for`, `else` etc, no space around the condition:
|
||||
|
||||
```javascript
|
||||
if (x) {
|
||||
console.log("I am a fish"); // Good
|
||||
}
|
||||
|
||||
if(x) {
|
||||
console.log("I am a fish"); // Bad
|
||||
}
|
||||
|
||||
if ( x ) {
|
||||
console.log("I am a fish"); // Bad
|
||||
}
|
||||
```
|
||||
- No new line before else, catch, finally, etc:
|
||||
|
||||
```javascript
|
||||
if (x) {
|
||||
console.log("I am a fish");
|
||||
} else {
|
||||
console.log("I am a chimp"); // Good
|
||||
}
|
||||
|
||||
if (x) {
|
||||
console.log("I am a fish");
|
||||
}
|
||||
else {
|
||||
console.log("I am a chimp"); // Bad
|
||||
}
|
||||
```
|
||||
- Declare one variable per var statement (consistent with Node). Unless they
|
||||
are simple and closely related. If you put the next declaration on a new line,
|
||||
treat yourself to another `var`:
|
||||
|
||||
```javascript
|
||||
const key = "foo",
|
||||
comparator = function(x, y) {
|
||||
return x - y;
|
||||
}; // Bad
|
||||
|
||||
const key = "foo";
|
||||
const comparator = function(x, y) {
|
||||
return x - y;
|
||||
}; // Good
|
||||
|
||||
let x = 0, y = 0; // Fine
|
||||
|
||||
let x = 0;
|
||||
let y = 0; // Also fine
|
||||
```
|
||||
- A single line `if` is fine, all others have braces. This prevents errors when adding to the code.:
|
||||
|
||||
```javascript
|
||||
if (x) return true; // Fine
|
||||
|
||||
if (x) {
|
||||
return true; // Also fine
|
||||
}
|
||||
|
||||
if (x)
|
||||
return true; // Not fine
|
||||
```
|
||||
- Terminate all multi-line lists, object literals, imports and ideally function calls with commas (if using a transpiler). Note that trailing function commas require explicit configuration in babel at time of writing:
|
||||
|
||||
```javascript
|
||||
var mascots = [
|
||||
"Patrick",
|
||||
"Shirley",
|
||||
"Colin",
|
||||
"Susan",
|
||||
"Sir Arthur David" // Bad
|
||||
];
|
||||
|
||||
var mascots = [
|
||||
"Patrick",
|
||||
"Shirley",
|
||||
"Colin",
|
||||
"Susan",
|
||||
"Sir Arthur David", // Good
|
||||
];
|
||||
```
|
||||
- Use `null`, `undefined` etc consistently with node:
|
||||
Boolean variables and functions should always be either true or false. Don't set it to 0 unless it's supposed to be a number.
|
||||
When something is intentionally missing or removed, set it to null.
|
||||
If returning a boolean, type coerce:
|
||||
|
||||
```javascript
|
||||
function hasThings() {
|
||||
return !!length; // bad
|
||||
return new Boolean(length); // REALLY bad
|
||||
return Boolean(length); // good
|
||||
}
|
||||
```
|
||||
Don't set things to undefined. Reserve that value to mean "not yet set to anything."
|
||||
Boolean objects are verboten.
|
||||
- Use JSDoc
|
||||
|
||||
ECMAScript
|
||||
----------
|
||||
- Use `const` unless you need a re-assignable variable. This ensures things you don't want to be re-assigned can't be.
|
||||
- Be careful migrating files to newer syntax.
|
||||
- Don't mix `require` and `import` in the same file. Either stick to the old style or change them all.
|
||||
- Likewise, don't mix things like class properties and `MyClass.prototype.MY_CONSTANT = 42;`
|
||||
- Be careful mixing arrow functions and regular functions, eg. if one function in a promise chain is an
|
||||
arrow function, they probably all should be.
|
||||
- Apart from that, newer ES features should be used whenever the author deems them to be appropriate.
|
||||
- Flow annotations are welcome and encouraged.
|
||||
|
||||
React
|
||||
-----
|
||||
- Use React.createClass rather than ES6 classes for components, as the boilerplate is way too heavy on ES6 currently. ES7 might improve it.
|
||||
- Pull out functions in props to the class, generally as specific event handlers:
|
||||
|
||||
```jsx
|
||||
<Foo onClick={function(ev) {doStuff();}}> // Bad
|
||||
<Foo onClick={(ev) => {doStuff();}}> // Equally bad
|
||||
<Foo onClick={this.doStuff}> // Better
|
||||
<Foo onClick={this.onFooClick}> // Best, if onFooClick would do anything other than directly calling doStuff
|
||||
```
|
||||
|
||||
Not doing so is acceptable in a single case; in function-refs:
|
||||
|
||||
```jsx
|
||||
<Foo ref={(self) => this.component = self}>
|
||||
```
|
||||
- Think about whether your component really needs state: are you duplicating
|
||||
information in component state that could be derived from the model?
|
||||
Loading…
Reference in New Issue