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Adjust MIMEType Predicate Signatures (#4832)

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Zachary DeRose 2021-02-04 15:46:30 -07:00 • committed by GitHub
parent 06dd10844d
commit 819554f6b3
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1 changed files with 9 additions and 8 deletions
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17
ts/types/MIME.ts
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@ -1,4 +1,4 @@
// Copyright 2018-2020 Signal Messenger, LLC
// Copyright 2018-2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only
export type MIMEType = string & { _mimeTypeBrand: never };
@ -17,12 +17,13 @@ export const VIDEO_MP4 = 'video/mp4' as MIMEType;
export const VIDEO_QUICKTIME = 'video/quicktime' as MIMEType;
export const LONG_MESSAGE = 'text/x-signal-plain' as MIMEType;
export const isJPEG = (value: MIMEType): boolean => value === 'image/jpeg';
export const isImage = (value: MIMEType): boolean =>
value && value.startsWith('image/');
export const isVideo = (value: MIMEType): boolean =>
value && value.startsWith('video/');
export const isJPEG = (value: string): value is MIMEType =>
value === 'image/jpeg';
export const isImage = (value: string): value is MIMEType =>
Boolean(value) && value.startsWith('image/');
export const isVideo = (value: string): value is MIMEType =>
Boolean(value) && value.startsWith('video/');
// As of 2020-04-16 aif files do not play in Electron nor Chrome. We should only
// recognize them as file attachments.
export const isAudio = (value: MIMEType): boolean =>
value && value.startsWith('audio/') && !value.endsWith('aiff');
export const isAudio = (value: string): value is MIMEType =>
Boolean(value) && value.startsWith('audio/') && !value.endsWith('aiff');