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diff --git a/deps/icu-small/source/i18n/number_asformat.h b/deps/icu-small/source/i18n/number_asformat.h
new file mode 100644
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+++ b/deps/icu-small/source/i18n/number_asformat.h
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+// © 2017 and later: Unicode, Inc. and others.
+// License & terms of use: http://www.unicode.org/copyright.html
+
+#include "unicode/utypes.h"
+
+#if !UCONFIG_NO_FORMATTING
+#ifndef __NUMBER_ASFORMAT_H__
+#define __NUMBER_ASFORMAT_H__
+
+#include "unicode/numberformatter.h"
+#include "number_types.h"
+#include "number_decimalquantity.h"
+#include "number_scientific.h"
+#include "number_patternstring.h"
+#include "number_modifiers.h"
+#include "number_multiplier.h"
+#include "number_roundingutils.h"
+#include "decNumber.h"
+#include "charstr.h"
+
+U_NAMESPACE_BEGIN namespace number {
+namespace impl {
+
+/**
+ * A wrapper around LocalizedNumberFormatter implementing the Format interface, enabling improved
+ * compatibility with other APIs.
+ *
+ * @draft ICU 62
+ * @see NumberFormatter
+ */
+class U_I18N_API LocalizedNumberFormatterAsFormat : public Format {
+  public:
+    LocalizedNumberFormatterAsFormat(const LocalizedNumberFormatter& formatter, const Locale& locale);
+
+    /**
+     * Destructor.
+     */
+    ~LocalizedNumberFormatterAsFormat() U_OVERRIDE;
+
+    /**
+     * Equals operator.
+     */
+    UBool operator==(const Format& other) const U_OVERRIDE;
+
+    /**
+     * Creates a copy of this object.
+     */
+    Format* clone() const U_OVERRIDE;
+
+    /**
+     * Formats a Number using the wrapped LocalizedNumberFormatter. The provided formattable must be a
+     * number type.
+     */
+    UnicodeString& format(const Formattable& obj, UnicodeString& appendTo, FieldPosition& pos,
+                          UErrorCode& status) const U_OVERRIDE;
+
+    /**
+     * Formats a Number using the wrapped LocalizedNumberFormatter. The provided formattable must be a
+     * number type.
+     */
+    UnicodeString& format(const Formattable& obj, UnicodeString& appendTo, FieldPositionIterator* posIter,
+                          UErrorCode& status) const U_OVERRIDE;
+
+    /**
+     * Not supported: sets an error index and returns.
+     */
+    void parseObject(const UnicodeString& source, Formattable& result,
+                     ParsePosition& parse_pos) const U_OVERRIDE;
+
+    /**
+     * Gets the LocalizedNumberFormatter that this wrapper class uses to format numbers.
+     *
+     * For maximum efficiency, this function returns by const reference. You must copy the return value
+     * into a local variable if you want to use it beyond the lifetime of the current object:
+     *
+     * <pre>
+     * LocalizedNumberFormatter localFormatter = fmt->getNumberFormatter();
+     * </pre>
+     *
+     * You can however use the return value directly when chaining:
+     *
+     * <pre>
+     * FormattedNumber result = fmt->getNumberFormatter().formatDouble(514.23, status);
+     * </pre>
+     *
+     * @return The unwrapped LocalizedNumberFormatter.
+     */
+    const LocalizedNumberFormatter& getNumberFormatter() const;
+
+    UClassID getDynamicClassID() const U_OVERRIDE;
+    static UClassID U_EXPORT2 getStaticClassID();
+
+  private:
+    LocalizedNumberFormatter fFormatter;
+
+    // Even though the locale is inside the LocalizedNumberFormatter, we have to keep it here, too, because
+    // LocalizedNumberFormatter doesn't have a getLocale() method, and ICU-TC didn't want to add one.
+    Locale fLocale;
+};
+
+} // namespace impl
+} // namespace number
+U_NAMESPACE_END
+
+#endif // __NUMBER_ASFORMAT_H__
+
+#endif /* #if !UCONFIG_NO_FORMATTING */