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diff --git a/web/flow-typed/WebCrypto.js b/web/flow-typed/WebCrypto.js
new file mode 100644
--- /dev/null
+++ b/web/flow-typed/WebCrypto.js
@@ -0,0 +1,285 @@
+// @flow
+
+declare interface RandomSource {
+ getRandomValues<T: $TypedArray>(typedArray: T): T;
+ randomUUID(): string;
+}
+
+declare interface Crypto extends RandomSource {
+ +subtle: SubtleCrypto;
+}
+
+type CryptoKey$Type = 'secret' | 'public' | 'private';
+type CryptoKey$Usages =
+ | 'encrypt'
+ | 'decrypt'
+ | 'sign'
+ | 'verify'
+ | 'deriveKey'
+ | 'deriveBits'
+ | 'wrapKey'
+ | 'unwrapKey';
+
+declare type CryptoKey = {
+ +algorithm:
+ | SubtleCrypto$AesKeyGenParams
+ | SubtleCrypto$RsaHashedKeyGenParams
+ | SubtleCrypto$EcKeyGenParams
+ | SubtleCrypto$HmacKeyGenParams,
+ +extractable: boolean,
+ +type: CryptoKey$Type,
+ +usages: $ReadOnlyArray<CryptoKey$Usages>,
+};
+
+type SubtleCrypto$KeyFormatWithoutJwk = 'pkcs8' | 'raw' | 'spki';
+type SubtleCrypto$KeyFormat = 'jwk' | SubtleCrypto$KeyFormatWithoutJwk;
+type SubtleCrypto$HashAlgo = 'SHA-1' | 'SHA-256' | 'SHA-384' | 'SHA-512';
+type SubtleCrypto$AesAlgo = 'AES-CBC' | 'AES-CTR' | 'AES-GCM' | 'AES-KW';
+
+type SubtleCrypto$RsaOaepParams = {
+ +name: 'RSA-OAEP',
+ +label?: BufferSource,
+};
+
+type SubtleCrypto$AesCtrParams = {
+ +name: 'AES-CTR',
+ +counter: BufferSource,
+ +length: number,
+};
+
+type SubtleCrypto$AesCbcParams = {
+ +name: 'AES-CBC',
+ +iv: BufferSource,
+};
+
+type SubtleCrypto$AesGcmParams = {
+ +name: 'AES-GCM',
+ +iv: BufferSource,
+ +additionalData?: BufferSource,
+ +tagLength?: number,
+};
+
+type SubtleCrypto$EcdhKeyDeriveParams = {
+ +name: 'ECDH',
+ +public: CryptoKey,
+};
+
+type SubtleCrypto$HkdfParams = {
+ +name: 'HKDF',
+ +hash: 'SHA-1' | 'SHA-256' | 'SHA-384' | 'SHA-512',
+ +info: BufferSource,
+ +salt: BufferSource,
+};
+
+type SubtleCrypto$Pbkdf2Params = {
+ +name: 'PBKDF2',
+ +hash: 'SHA-1' | 'SHA-256' | 'SHA-384' | 'SHA-512',
+ +iterations: number,
+ +salt: BufferSource,
+};
+
+type SubtleCrypto$HmacImportParams = {
+ +name: 'HMAC',
+ +hash: 'SHA-256' | 'SHA-384' | 'SHA-512',
+ +length?: number,
+};
+
+type SubtleCrypto$RsaHashedKeyGenParams = {
+ +name: 'RSASSA-PKCS1-v1_5' | 'RSA-PSS' | 'RSA-OAEP',
+ +modulusLength: number,
+ +publicExponent: Uint8Array,
+ +hash: 'SHA-256' | 'SHA-384' | 'SHA-512',
+};
+
+type SubtleCrypto$HmacKeyGenParams = {
+ +name: 'HMAC',
+ +hash: SubtleCrypto$HashAlgo,
+ +length?: number,
+};
+
+type SubtleCrypto$RsaHashedImportParams = {
+ +name: 'RSASSA-PKCS1-v1_5' | 'RSA-PSS' | 'RSA-OAEP',
+ +hash: 'SHA-256' | 'SHA-384' | 'SHA-512',
+};
+
+type SubtleCrypto$EcKeyImportParams = {
+ +name: 'ECDSA' | 'ECDH',
+ +namedCurve: 'P-256' | 'P-384' | 'P-521',
+};
+
+type SubtleCrypto$EcKeyGenParams = {
+ +name: 'ECDSA' | 'ECDH',
+ +namedCurve: 'P-256' | 'P-384' | 'P-521',
+};
+
+type SubtleCrypto$RsaPssParams = {
+ +name: 'RSA-PSS',
+ +saltLength: number,
+};
+
+type SubtleCrypto$EcdsaParams = {
+ +name: 'ECDSA',
+ +hash: 'SHA-256' | 'SHA-384' | 'SHA-512',
+};
+
+type SubtleCrypto$AesKeyGenParams = {
+ +name: 'AES-CBC' | 'AES-CTR' | 'AES-GCM' | 'AES-KW',
+ +length: 128 | 192 | 256,
+};
+
+type SubtleCrypto$ImportKeyAlgo =
+ | SubtleCrypto$RsaHashedImportParams
+ | SubtleCrypto$EcKeyImportParams
+ | SubtleCrypto$HmacImportParams
+ | SubtleCrypto$AesAlgo
+ | 'PBKDF2'
+ | 'HKDF';
+
+type SubtleCrypto$RsaOtherPrimesInfo = {
+ +d?: string,
+ +r?: string,
+ +t?: string,
+};
+
+type SubtleCrypto$JsonWebKey = {
+ +alg?: string,
+ +crv?: string,
+ +d?: string,
+ +dp?: string,
+ +dq?: string,
+ +e?: string,
+ +ext?: boolean,
+ +k?: string,
+ +key_ops?: $ReadOnlyArray<string>,
+ +kty?: string,
+ +n?: string,
+ +oth?: $ReadOnlyArray<SubtleCrypto$RsaOtherPrimesInfo>,
+ +p?: string,
+ +q?: string,
+ +qi?: string,
+ +use?: string,
+ +x?: string,
+ +y?: string,
+};
+
+declare interface SubtleCrypto {
+ decrypt(
+ algorithm:
+ | SubtleCrypto$RsaOaepParams
+ | SubtleCrypto$AesCtrParams
+ | SubtleCrypto$AesCbcParams
+ | SubtleCrypto$AesGcmParams,
+ key: CryptoKey,
+ data: BufferSource,
+ ): Promise<ArrayBuffer>;
+ deriveBits(
+ algorithm:
+ | SubtleCrypto$EcdhKeyDeriveParams
+ | SubtleCrypto$HkdfParams
+ | SubtleCrypto$Pbkdf2Params,
+ baseKey: CryptoKey,
+ length: number,
+ ): Promise<ArrayBuffer>;
+ deriveKey(
+ algorithm:
+ | SubtleCrypto$EcdhKeyDeriveParams
+ | SubtleCrypto$HkdfParams
+ | SubtleCrypto$Pbkdf2Params,
+ baseKey: CryptoKey,
+ derivedKeyType:
+ | SubtleCrypto$HmacKeyGenParams
+ | SubtleCrypto$AesKeyGenParams,
+ extractable: boolean,
+ keyUsages: $ReadOnlyArray<CryptoKey$Usages>,
+ ): Promise<CryptoKey>;
+ digest(
+ algorithm: SubtleCrypto$HashAlgo | { +name: SubtleCrypto$HashAlgo },
+ data: BufferSource,
+ ): Promise<ArrayBuffer>;
+ encrypt(
+ algorithm:
+ | SubtleCrypto$RsaOaepParams
+ | SubtleCrypto$AesCtrParams
+ | SubtleCrypto$AesCbcParams
+ | SubtleCrypto$AesGcmParams,
+ key: CryptoKey,
+ data: BufferSource,
+ ): Promise<ArrayBuffer>;
+ exportKey(format: 'jwk', key: CryptoKey): Promise<SubtleCrypto$JsonWebKey>;
+ exportKey(
+ format: SubtleCrypto$KeyFormatWithoutJwk,
+ key: CryptoKey,
+ ): Promise<ArrayBuffer>;
+ generateKey(
+ algorithm:
+ | SubtleCrypto$RsaHashedKeyGenParams
+ | SubtleCrypto$EcKeyGenParams
+ | SubtleCrypto$HmacKeyGenParams
+ | SubtleCrypto$AesKeyGenParams,
+ extractable: boolean,
+ keyUsages: $ReadOnlyArray<CryptoKey$Usages>,
+ ): Promise<CryptoKey>;
+ importKey(
+ format: SubtleCrypto$KeyFormatWithoutJwk,
+ keyData: BufferSource,
+ algorithm: SubtleCrypto$ImportKeyAlgo,
+ extractable: boolean,
+ keyUsages: $ReadOnlyArray<CryptoKey$Usages>,
+ ): Promise<CryptoKey>;
+ importKey(
+ format: 'jwk',
+ keyData: SubtleCrypto$JsonWebKey,
+ algorithm: SubtleCrypto$ImportKeyAlgo,
+ extractable: boolean,
+ keyUsages: $ReadOnlyArray<CryptoKey$Usages>,
+ ): Promise<CryptoKey>;
+
+ sign(
+ algorithm:
+ | 'RSASSA-PKCS1-v1_5'
+ | 'HMAC'
+ | SubtleCrypto$RsaPssParams
+ | SubtleCrypto$EcdsaParams,
+ key: CryptoKey,
+ data: BufferSource,
+ ): Promise<ArrayBuffer>;
+ unwrapKey(
+ format: SubtleCrypto$KeyFormat,
+ wrappedKey: ArrayBuffer,
+ unwrappingKey: CryptoKey,
+ unwrapAlgorithm:
+ | SubtleCrypto$RsaOaepParams
+ | SubtleCrypto$AesCtrParams
+ | SubtleCrypto$AesCbcParams
+ | SubtleCrypto$AesGcmParams
+ | 'AES-KW',
+ unwrappedKeyAlgorithm: SubtleCrypto$ImportKeyAlgo,
+ extractable: boolean,
+ keyUsages: $ReadOnlyArray<CryptoKey$Usages>,
+ ): Promise<CryptoKey>;
+ verify(
+ algorithm:
+ | SubtleCrypto$RsaPssParams
+ | SubtleCrypto$EcdsaParams
+ | 'RSASSA-PKCS1-v1_5'
+ | 'HMAC',
+ key: CryptoKey,
+ signature: ArrayBuffer,
+ data: ArrayBuffer,
+ ): Promise<boolean>;
+ wrapKey(
+ format: SubtleCrypto$KeyFormat,
+ key: CryptoKey,
+ wrappingKey: CryptoKey,
+ wrapAlgorithm:
+ | SubtleCrypto$RsaOaepParams
+ | SubtleCrypto$AesCtrParams
+ | SubtleCrypto$AesCbcParams
+ | SubtleCrypto$AesGcmParams
+ | 'AES-KW',
+ ): Promise<ArrayBuffer>;
+}
+
+declare var crypto: Crypto;
+declare var msCrypto: Crypto;
+declare var webkitCrypto: Crypto;
diff --git a/web/utils/text-utils.js b/web/utils/text-utils.js
--- a/web/utils/text-utils.js
+++ b/web/utils/text-utils.js
@@ -4,11 +4,6 @@
let canvas;
-declare var crypto: {
- getRandomValues<NumArray: $TypedArray>(typedArray: NumArray): NumArray,
- ...
-};
-
function calculateMaxTextWidth(
texts: $ReadOnlyArray<string>,
font: string,

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