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extract_ignores_above_position,
extract_svelte_ignore_from_comments
} from './utils/extract_svelte_ignore.js';
/** @typedef {Record<string, (...args: any[]) => string>} Warnings */
/** @satisfies {Warnings} */
const css = {
/** @param {string} name */
'css-unused-selector': (name) => `Unused CSS selector "${name}"`
};
/** @satisfies {Warnings} */
const attributes = {
'avoid-is': () => 'The "is" attribute is not supported cross-browser and should be avoided',
/** @param {string} name */
'global-event-reference': (name) =>
`You are referencing globalThis.${name}. Did you forget to declare a variable with that name?`,
'illegal-attribute-character': () =>
"Attributes should not contain ':' characters to prevent ambiguity with Svelte directives",
/**
* @param {string} wrong
* @param {string} right
*/
'invalid-html-attribute': (wrong, right) =>
`'${wrong}' is not a valid HTML attribute. Did you mean '${right}'?`
};
/** @satisfies {Warnings} */
const runes = {
/** @param {string} name */
'store-with-rune-name': (name) =>
`It looks like you're using the $${name} rune, but there is a local binding called ${name}. ` +
`Referencing a local variable with a $ prefix will create a store subscription. Please rename ${name} to avoid the ambiguity.`,
/** @param {string} name */
'non-state-reference': (name) =>
`${name} is updated, but is not declared with $state(...). Changing its value will not correctly trigger updates.`,
'derived-iife': () =>
`Use \`$derived.by(() => {...})\` instead of \`$derived((() => {...})());\``,
'invalid-props-declaration': () =>
`Component properties are declared using $props() in runes mode. Did you forget to call the function?`,
'invalid-bindable-declaration': () =>
`Bindable component properties are declared using $bindable() in runes mode. Did you forget to call the function?`
};
/** @satisfies {Warnings} */
const a11y = {
/** @param {string} name */
'a11y-aria-attributes': (name) => `A11y: <${name}> should not have aria-* attributes`,
/**
* @param {string} attribute
* @param {string | null} [suggestion]
*/
'a11y-unknown-aria-attribute': (attribute, suggestion) =>
`A11y: Unknown aria attribute 'aria-${attribute}'` +
(suggestion ? ` (did you mean '${suggestion}'?)` : ''),
/** @param {string} name */
'a11y-hidden': (name) => `A11y: <${name}> element should not be hidden`,
/**
* @param {import('aria-query').ARIAPropertyDefinition} schema
* @param {string} attribute
*/
'a11y-incorrect-aria-attribute-type': (schema, attribute) => {
let message;
switch (schema.type) {
case 'boolean':
message = `The value of '${attribute}' must be exactly one of true or false`;
break;
case 'id':
message = `The value of '${attribute}' must be a string that represents a DOM element ID`;
break;
case 'idlist':
message = `The value of '${attribute}' must be a space-separated list of strings that represent DOM element IDs`;
break;
case 'tristate':
message = `The value of '${attribute}' must be exactly one of true, false, or mixed`;
break;
case 'token':
message = `The value of '${attribute}' must be exactly one of ${(schema.values || []).join(
', '
)}`;
break;
case 'tokenlist':
message = `The value of '${attribute}' must be a space-separated list of one or more of ${(
schema.values || []
).join(', ')}`;
break;
default:
message = `The value of '${attribute}' must be of type ${schema.type}`;
}
return `A11y: ${message}`;
},
'a11y-aria-activedescendant-has-tabindex': () =>
'A11y: Elements with attribute aria-activedescendant should have tabindex value',
/** @param {string} name */
'a11y-misplaced-role': (name) => `A11y: <${name}> should not have role attribute`,
/** @param {string | boolean} role */
'a11y-no-abstract-role': (role) => `A11y: Abstract role '${role}' is forbidden`,
/**
* @param {string | boolean} role
* @param {string | null} [suggestion]
*/
'a11y-unknown-role': (role, suggestion) =>
`A11y: Unknown role '${role}'` + (suggestion ? ` (did you mean '${suggestion}'?)` : ''),
/** @param {string | boolean} role */
'a11y-no-redundant-roles': (role) => `A11y: Redundant role '${role}'`,
/**
* @param {string} role
* @param {string[]} props
*/
'a11y-role-has-required-aria-props': (role, props) =>
`A11y: Elements with the ARIA role "${role}" must have the following attributes defined: ${props
.map((name) => `"${name}"`)
.join(', ')}`,
/** @param {string} role */
'a11y-interactive-supports-focus': (role) =>
`A11y: Elements with the '${role}' interactive role must have a tabindex value.`,
/**
* @param {string | boolean} role
* @param {string} element
*/
'a11y-no-interactive-element-to-noninteractive-role': (role, element) =>
`A11y: <${element}> cannot have role '${role}'`,
/**
* @param {string | boolean} role
* @param {string} element
*/
'a11y-no-noninteractive-element-to-interactive-role': (role, element) =>
`A11y: Non-interactive element <${element}> cannot have interactive role '${role}'`,
'a11y-accesskey': () => 'A11y: Avoid using accesskey',
'a11y-autofocus': () => 'A11y: Avoid using autofocus',
'a11y-misplaced-scope': () => 'A11y: The scope attribute should only be used with <th> elements',
'a11y-positive-tabindex': () => 'A11y: avoid tabindex values above zero',
'a11y-click-events-have-key-events': () =>
'A11y: visible, non-interactive elements with a click event must be accompanied by a keyboard event handler. Consider whether an interactive element such as <button type="button"> or <a> might be more appropriate. See https://svelte.dev/docs/accessibility-warnings#a11y-click-events-have-key-events for more details.',
'a11y-no-noninteractive-tabindex': () =>
'A11y: noninteractive element cannot have nonnegative tabIndex value',
/**
* @param {string} attribute
* @param {string} role
* @param {boolean} is_implicit
* @param {string} name
*/
'a11y-role-supports-aria-props': (attribute, role, is_implicit, name) => {
let message = `The attribute '${attribute}' is not supported by the role '${role}'.`;
if (is_implicit) {
message += ` This role is implicit on the element <${name}>.`;
}
return `A11y: ${message}`;
},
/** @param {string} element */
'a11y-no-noninteractive-element-interactions': (element) =>
`A11y: Non-interactive element <${element}> should not be assigned mouse or keyboard event listeners.`,
/**
* @param {string} element
* @param {string[]} handlers
*/
'a11y-no-static-element-interactions': (element, handlers) =>
`A11y: <${element}> with ${handlers.join(', ')} ${
handlers.length === 1 ? 'handler' : 'handlers'
} must have an ARIA role`,
/**
* @param {string} href_attribute
* @param {string} href_value
*/
'a11y-invalid-attribute': (href_attribute, href_value) =>
`A11y: '${href_value}' is not a valid ${href_attribute} attribute`,
/**
* @param {string} name
* @param {string} article
* @param {string} sequence
*/
'a11y-missing-attribute': (name, article, sequence) =>
`A11y: <${name}> element should have ${article} ${sequence} attribute`,
/**
* @param {null | true | string} type
* @param {null | true | string} value
*/
'a11y-autocomplete-valid': (type, value) =>
`A11y: The value '${value}' is not supported by the attribute 'autocomplete' on element <input type="${
type || '...'
}">`,
'a11y-img-redundant-alt': () =>
'A11y: Screenreaders already announce <img> elements as an image.',
'a11y-label-has-associated-control': () =>
'A11y: A form label must be associated with a control.',
'a11y-media-has-caption': () => 'A11y: <video> elements must have a <track kind="captions">',
/** @param {string} name */
'a11y-distracting-elements': (name) => `A11y: Avoid <${name}> elements`,
/** @param {boolean} immediate */
'a11y-structure': (immediate) =>
immediate
? 'A11y: <figcaption> must be an immediate child of <figure>'
: 'A11y: <figcaption> must be first or last child of <figure>',
/**
* @param {string} event
* @param {string} accompanied_by
*/
'a11y-mouse-events-have-key-events': (event, accompanied_by) =>
`A11y: '${event}' event must be accompanied by '${accompanied_by}' event`,
/** @param {string} name */
'a11y-missing-content': (name) => `A11y: <${name}> element should have child content`
};
/** @satisfies {Warnings} */
const state = {
'static-state-reference': () =>
`State referenced in its own scope will never update. Did you mean to reference it inside a closure?`,
/** @param {string} name */
'invalid-rest-eachblock-binding': (name) =>
`The rest operator (...) will create a new object and binding '${name}' with the original object will not work`
};
/** @satisfies {Warnings} */
const performance = {
'avoid-inline-class': () =>
`Avoid 'new class' — instead, declare the class at the top level scope`,
'avoid-nested-class': () => `Avoid declaring classes below the top level scope`
};
/** @satisfies {Warnings} */
const components = {
/** @param {string} name */
'component-name-lowercase': (name) =>
`<${name}> will be treated as an HTML element unless it begins with a capital letter`
};
const legacy = {
'no-reactive-declaration': () =>
`Reactive declarations only exist at the top level of the instance script`,
'module-script-reactive-declaration': () =>
'All dependencies of the reactive declaration are declared in a module script and will not be reactive',
/** @param {string} name */
'unused-export-let': (name) =>
`Component has unused export property '${name}'. If it is for external reference only, please consider using \`export const ${name}\``,
'deprecated-slot-element': () =>
`Using <slot> to render parent content is deprecated. Use {@render ...} tags instead.`,
/** @param {string} name */
'deprecated-event-handler': (name) =>
`Using on:${name} to listen to the ${name} event is is deprecated. Use the event attribute on${name} instead.`
};
const block = {
'empty-block': () => 'Empty block'
};
const options = {
'missing-custom-element-compile-option': () =>
"The 'customElement' option is used when generating a custom element. Did you forget the 'customElement: true' compile option?"
};
/** @satisfies {Warnings} */
const warnings = {
...css,
...attributes,
...runes,
...a11y,
...performance,
...state,
...components,
...legacy,
...block,
...options
};
/** @typedef {typeof warnings} AllWarnings */
/**
* @template {keyof AllWarnings} T
* @param {import('./phases/types').RawWarning[]} array the array to push the warning to, if not ignored
* @param {{ start?: number, end?: number, type?: string, parent?: import('#compiler').SvelteNode | null, leadingComments?: import('estree').Comment[] } | null} node the node related to the warning
* @param {import('#compiler').SvelteNode[]} path the path to the node, so that we can traverse upwards to find svelte-ignore comments
* @param {T} code the warning code
* @param {Parameters<AllWarnings[T]>} args the arguments to pass to the warning function
* @returns {void}
*/
export function warn(array, node, path, code, ...args) {
const fn = warnings[code];
// Traverse the AST upwards to find any svelte-ignore comments.
// This assumes that people don't have their code littered with warnings,
// at which point this might become inefficient.
/** @type {string[]} */
const ignores = [];
if (node) {
// comments inside JavaScript (estree)
if ('leadingComments' in node) {
ignores.push(...extract_svelte_ignore_from_comments(node));
}
}
for (let i = path.length - 1; i >= 0; i--) {
const current = path[i];
// comments inside JavaScript (estree)
if ('leadingComments' in current) {
ignores.push(...extract_svelte_ignore_from_comments(current));
}
// Svelte nodes
if (current.type === 'Fragment') {
ignores.push(
...extract_ignores_above_position(
/** @type {import('#compiler').TemplateNode} */ (path[i + 1] ?? node),
current.nodes
)
);
}
// Style nodes
if (current.type === 'StyleSheet' && current.content.comment) {
ignores.push(...current.content.comment.ignores);
}
}
if (ignores.includes(code)) return;
const start = node?.start;
const end = node?.end;
array.push({
code,
// @ts-expect-error
message: fn(...args),
position: start !== undefined && end !== undefined ? [start, end] : undefined
});
}
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