react/jsx-boolean-value

In JSX, <input disabled /> and <input disabled={true} /> mean the same thing. This rule makes your codebase stick to one of them. By default it wants the short form.

--fix removes or adds the ={true}.

Configure#

Off by default. To turn it on:

bunfig.toml

[lint.rules]
"react/jsx-boolean-value" = "error" # or "warn"

Every option, set to its default:

bunfig.toml

[lint.rules]
"react/jsx-boolean-value" = [
  "error",
  "never", # "always" or "never"
  {
    always = [], # list of strings
    assumeUndefinedIsFalse = false,
  },
]

Examples#

example.jsx1 problem

const field = <input type="checkbox" checked={true} />;

example.jsxNo problems

const field = <input type="checkbox" checked />;

const other = <input type="checkbox" checked={false} disabled={isLocked} />;

Options#

bunfig.toml

[lint.rules]
"react/jsx-boolean-value" = ["error", "always"]

Option	What it does
`"never"` (default)	Report `checked={true}`.
`"always"`	Report `checked` without a value.

example.jsxwith "always"1 problem

const field = <input type="checkbox" checked />;

example.jsxwith "always"No problems

const field = <input type="checkbox" checked={true} />;

The second option is an object:

Option	Default	What it does
`always`	`[]`	With `"never"`: attributes that must have `={true}`.
`never`	`[]`	With `"always"`: attributes that must not have `={true}`.
`assumeUndefinedIsFalse`	`false`	Also report `={false}` on an attribute that must not have a value. `--fix` removes the whole attribute.

example.jsxwith "never", { "always": ["selected"] }2 problems

const tab = <Tab selected closable={true} />;

example.jsxwith "never", { "always": ["selected"] }No problems

const tab = <Tab selected={true} closable />;

example.jsxwith "never", { "assumeUndefinedIsFalse": true }1 problem

const tab = <Tab closable={false} />;

Only turn on assumeUndefinedIsFalse if your components treat a missing prop like false. A prop that defaults to true changes meaning when the attribute is removed.